Changes to gcc's documents (particularly gnat's)

[Guo Yixuan <culu.gyx@gmail.com>]

Hello,

I recently took over maintenance of gcc-4.4-doc-non-dfsg, gcc-4.6-doc,
gcc-4.7-doc, and gcc-doc-defaults, and started to updating them. I wish
to discuss here on my plan and some questions on which I want to hear
your advices.

Here're current versions of relevant packages in sid, and I guess this
is the plan for wheezy.

gcc and cpp  4.4, 4.6, 4.7
gfortran     4.4, 4.6, 4.7
gcj               4.6, 4.7
gnat         4.4, 4.6
gccgo                  4.7

So, for example, I'll remove gcj-4.4-doc and gccgo-4.6-doc in next upload.

In trying to fix #594384, I found that gnat's info direntry is handled
differently in rename-info-files.diff, and switched them to use
versioned names in git repo[1][2](similar commits are in debian/4.6 and
debian/4.7). Thus the changes in info's dir will be like:

-* GNAT Reference Manual: (gnat_rm-4.4).
+* GNAT 4.4 Reference Manual: (gnat_rm-4.4).

This will make gnat-4.4-doc and gnat-4.6-doc co-installable, for
example. (Although I know gnat-4.4 and gnat-4.6 conflicts,
co-installable is a good idea, IMO.) Please tell me if it's not
appropriate or there're better ideas.

[1]
http://anonscm.debian.org/gitweb/?p=users/yixuan-guest/gcc-doc.git;a=commitdiff;h=fb2e9fc8092581fd390dd65a685f8a318e2460e5
[2]
anonscm.debian.org/gitweb/?p=users/yixuan-guest/gcc-doc.git;a=commitdiff;h=fe09382bafd7ef93223e0690d13f96b19354277e

Cheers,

GUO Yixuan