Sync readline/ to version 7.0 alpha

This patch syncs our upstream copy of readline from version 6.2 to the
latest version, 7.0 alpha (released July 10 2015).

I essentially copied what was done the last time readline was synced,
when Jan updated to readline 6.2 in 2011:
http://sourceware.org/ml/gdb-patches/2011-05/msg00003.html

Procedure:

1. I extracted the readline-7.0-alpha tarball on top of readline/.
2. I deleted all the new files under doc/ that were deliberately omitted
   before.
3. I regenerated readline/configure and readline/examples/rlfe/configure
   using autoconf 2.64.  No other configure files need regenerating.
4. I updated the function gdb_printable_part in completer.c with a
   trivial change made to the readline function it is based off of,
   printable_part in readline/complete.c.  There is more work to be done in
   completer.c to sync it with readline/complete.c, but it is non-trivial
   and should probably be done separately anyway.

Local patches that had to be reapplied:

    None.  readline 7.0 alpha contains all of our local readline
    patches.

New files in readline/:

    colors.{c,h}
    examples/{hist_erasedups,hist_purgecmd,rl-callbacktest,rlbasic}.c
    parse-colors.{c,h}
    readline.pc.in
    configure.ac

Deleted files in readline/:

    configure.in

Regressions:

After the sync there is one testsuite regression, the test
"signal SIGINT" in gdb.gdb/selftest.exp which now FAILs.  Previously,
the readline 6.2 SIGINT handler would temporarily reinstall the
underlying application's SIGINT handler and immediately re-raise SIGINT
so that the orginal handler gets invoked.  But now (since readline 6.3)
its SIGINT handler does not re-raise SIGINT or directly invoke the
original handler; it now sets a flag marking that SIGINT was raised, and
waits until readline explicitly has control to call the application's
SIGINT handler.  Anyway, because SIGINT is no longer re-raised from
within readline's SIGINT handler, doing "signal SIGINT" with a stopped
inferior gdb process will no longer resume and then immediately stop the
process (since there is no 2nd SIGINT to immediately catch).  Instead,
the inferior gdb process will now just print "Quit" and continue to run.
So with this commit, this particular test case is adjusted to reflect
this change in behavior (we now have to send a 2nd SIGINT manually to
stop it).

Aside from this one testsuite regression, I personally noticed no
regression in user-visible behavior.  Though I only tested on x86_64
and on i686 Debian Stretch.

Getting this kind of change in at the start of the GDB 7.11 development
cycle will allow us to get a lot of passive testing from developers and
from bleeding-edge users.

readline/ChangeLog.gdb:

	Import readline 7.0 alpha
	* configure: Regenerate.
	* examples/rlfe/configure: Regenerate.

gdb/ChangeLog:

	* completer.c (gdb_printable_part): Sync with readline function
	it is based off of.

gdb/testsuite/ChangeLog:

	* gdb.gdb/selftest.exp (test_with_self): Update test to now
	expect the GDB inferior to no longer immediately stop after
	being resumed with "signal SIGINT".

1 files changed, 18 insertions, 15 deletions

diff --git a/readline/doc/history.3 b/readline/doc/history.3
index 4eb159c9d11..7ddc26ae353 100644
--- a/readline/doc/history.3
+++ b/readline/doc/history.3
@@ -4,11 +4,11 @@
 .\"	Chet Ramey
 .\"	Information Network Services
 .\"	Case Western Reserve University
-.\"	chet@ins.CWRU.Edu
+.\"	chet.ramey@case.edu
 .\"
-.\"	Last Change: Thu Aug 12 22:24:41 EDT 2010
+.\"	Last Change: Sun May 24 18:01:17 EDT 2015
 .\"
-.TH HISTORY 3 "2010 August 12" "GNU History 6.2"
+.TH HISTORY 3 "2015 May 24" "GNU History 6.3"
 .\"
 .\" File Name macro.  This used to be `.PN', for Path Name,
 .\" but Sun doesn't seem to like that very much.
@@ -40,8 +40,8 @@
 .SH NAME
 history \- GNU History Library
 .SH COPYRIGHT
-.if t The GNU History Library is Copyright \(co 1989-2011 by the Free Software Foundation, Inc.
-.if n The GNU History Library is Copyright (C) 1989-2011 by the Free Software Foundation, Inc.
+.if t The GNU History Library is Copyright \(co 1989-2014 by the Free Software Foundation, Inc.
+.if n The GNU History Library is Copyright (C) 1989-2014 by the Free Software Foundation, Inc.
 .SH DESCRIPTION
 Many programs read input from the user a line at a time.  The GNU
 History library is able to keep track of those lines, associate arbitrary
@@ -112,7 +112,7 @@ starting with
 .TP
 .B !?\fIstring\fR\fB[?]\fR
 Refer to the most recent command
-preceding the current postition in the history list
+preceding the current position in the history list
 containing
 .IR string .
 The trailing \fB?\fP may be omitted if
@@ -134,7 +134,7 @@ The entire command line typed so far.
 .SS Word Designators
 .PP
 Word designators are used to select desired words from the event.
-A 
+A
 .B :
 separates the event specification from the word designator.
 It may be omitted if the word designator begins with a
@@ -161,7 +161,8 @@ The \fIn\fRth word.
 The first argument.  That is, word 1.
 .TP
 .B $
-The last argument.
+The last word.  This is usually the last argument, but will expand to the
+zeroth word if there is only one word in the line.
 .TP
 .B %
 The word matched by the most recent `?\fIstring\fR?' search.
@@ -440,9 +441,11 @@ return a pointer to that entry.  If there is no previous entry, return
 a \fBNULL\fP pointer.
 
 .Fn1 "HIST_ENTRY *" next_history "void"
-Move the current history offset forward to the next history entry, and
-return the a pointer to that entry.  If there is no next entry, return
-a \fBNULL\fP pointer.
+If the current history offset refers to a valid history entry,
+increment the current history offset.
+If the possibly-incremented history offset refers to a valid history
+entry, return a pointer to that entry;
+otherwise, return a \fBNULL\fP pointer.
 
 .SS Searching the History List
 
@@ -612,8 +615,8 @@ string, in addition to space, tab, \fI:\fP and \fI?\fP in the case of
 a substring search.  The default is empty.
 
 .Vb int history_quotes_inhibit_expansion
-If non-zero, single-quoted words are not scanned for the history expansion
-character.  The default value is 0.
+If non-zero, double-quoted words are not scanned for the history expansion
+character or the history comment character.  The default value is 0.
 
 .Vb "rl_linebuf_func_t *" history_inhibit_expansion_function
 This should be set to the address of a function that takes two arguments:
@@ -649,7 +652,7 @@ bfox@gnu.org
 .PP
 Chet Ramey, Case Western Reserve University
 .br
-chet@ins.CWRU.Edu
+chet.ramey@case.edu
 .SH BUG REPORTS
 If you find a bug in the
 .B history
@@ -669,4 +672,4 @@ newsgroup
 .PP
 Comments and bug reports concerning
 this manual page should be directed to
-.IR chet@ins.CWRU.Edu .
+.IR chet.ramey@case.edu .