Generalize the dcc_{r,x}_argv routines so they can be used to
transfer arbitrary array-of-strings tokens (useful for protocol
hacking experiments; no functional change).

to do a better job of error checking.

distcc-pump compilation.  This fixes a bug where distcc-pump was changing
to a directory and then deleting that directory and not changing back
to the original directory.  That caused problems when you used a server
first in distcc-pump mode and then in distcc mode, and the compiler
invoked a shell script.  The compilation would succeed, but the shell would
report a confusing warning ("shell-init: error retrieving current directory:
getcwd: cannot access parent directories: No such file or directory").

add 1, 3, 5 minute averages of the number of children
used on a server to the statistics collected by the
stats server.

Optional GSS-API Functionality.

This patch implements mutual authentication, out of sequence and
replay detection using the GSS-API.  The changes implemented are
optional and are turned off by default.

This option is specified to the client through an environment variable
as is the name of the server principal to authenticate.  Currently
the server principal can be left unspecified and a default based on
the host keytab will be used.

This option is specified to the daemon through a command line option,
with the name of the principal whose credentials the daemon should
use specified as an environment variable.  A simple handshake is
exchanged between the client and server in order to prevent
unecessary delays and protocol derailments when mixing authenticating
and non-authenticating clients and servers.

Revised based on review comments.
GSS-API authentication is now implemented as a per host option.

Revised further by me (Fergus Henderson) to fix a spelling error
and to rename the per host option from ",gssapi" to ",auth".

Some more bug fixes to make the test case pass.

Also, make the DashWpMD_Case test a bit more strict: disable
fallbacks, so that it tests that we can distribute such jobs.

(typically the only change is in the FSF street address).  Add Google
copyright line in some places it was missing.  Add GPLv2 notice to
avahi patches.

OKed by fergus

Also, fix the emacs var-setting line: it was missing a semicolon
before, which means the entire line was being ignored.

No contentful change.

Reviewed by fergus@google.com

lines.  Fixed up resulting mis-indented code I noticed (mostly in
files that used 8 space indents, or used 4-space and 8-space indents
in the same file (!)).  Added the emacs tab-var setting for all files,
not just some of them.

I also added in copyright notices for files I noticed that didn't have
them.  We'll want to do another pass-through to fix these up properly,
though.

I used the following perl snippet to check for mis-indented code after
converting tabs to whitespace:

  $ for i in *.{c,h}; do echo $i; perl -nle 'if ($indent > 0) {$sp=" " x $indent; /^$sp[^ ]/ && print "$.: $_"; $indent=0;}; if (/^( *).*{/ ) {$indent=length($1);} else {$indent=0;}' $i; done | less

It had false positives, but hopefully didn't miss anything.

Reviewed by klarlund@google.com

affects the way emacs users will see these files, when visiting them
in emacs.  In particular, tabs will show up as 4 spaces, which is
(clearly) the setting the original distcc author used when writing the
code.

We also set an emacs variable to never insert new tabs, but use spaces
instead.  This will help stop the problem we have now with mixed tabs
and spaces.  In a future cleanup, we may replace all tabs with 4
spaces, and make other whitespace improvements.

The final new variable set, is to set line-wrapping at 78 chars.
Personally, I would have made it more like 72, but some existing files
already had the 78 limit, so I just do that everywhere, to be
consistent.

Reviewed by fergus@google.com