(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 add support for setting the number of hosts to use.

Fix division by zero error that occurred when running benchmark script with the "-a" option.

Fix broken URL for GNU hello package.

Reviewers: Craig Silverstein, Nils Klarlund

directory up to the top level: delete the distcc directory (I already
copied it all to the top level in my last commit).

This requires changing all files that refer to distcc/FOO to refer
directly to FOO instead.  Mostly this is Makefile.in and setup.py, but
there are a few other changes in scripts that have to hard-code paths,
like configure.ac and pump.in.  Also, several files changed their
comments to refer to the new location, which isn't strictly necessary
but I did anyway.

The only other change I made was to get rid of the hack I had put in
before, which renamed distcc to distcc-bin.  I had needed to do that
before, temporarily, because "distcc" was already the name of a
directory, and couldn't also be the name of a binary.  Now that the
distcc directory is going away, I can rename the target back to
distcc.

Tested by running './autogen; ./configure; make maintainer-check'.
I also ran 'make pump-check' and 'make distcheck'.

To be reviewed (post-facto) by klarlund@google.com and fergus@google.com

level.  I'm doing this in two stages, because I don't understand svn
enough to be confident to do it in one.  This first stage just copies
all the files from distcc/FOO to FOO.  Now there are two copies of
each file under distcc; the Makefile/etc uses the one in distcc and
ignores the one at the top level.

The next commit will delete everything under distcc, and rewrite the
Makefile/etc to use the top-level versions instead.