[PATCH 0/6] gitweb: 'commitdiff' view improvements

The following series makes a few improvements to 'commitdiff' view.
The final goal of the series is to use '--cc' (compact combined)
format for merge commits in gitweb, as requested by Linus Torvalds
in
  Message-ID: <Pine.LNX.4.64.0610061202060.3952@g5.osdl.org>
with a few other improvements.

Table of contents:
------------------
 gitweb: Provide links to commitdiff to each parent in 'commitdiff' view
 gitweb: Improve "next" link in commitdiff view
 gitweb: Split git_patchset_body into separate subroutines
 gitweb: Create special from-file/to-file header for combined diff
 gitweb: Add links to blobdiffs in from-file/to-file header for merges
 gitweb: '--cc' for merges in 'commitdiff' view

The first two patches are totally independent of other patches, and are not required by anu patches.

The "Split git_patchset_body" is required for all subsequent patches; those patches shows why it was needed. The last patch is conceptually indepenent on the "improve from-file/to-file header for merges" patches.

Diffstat:
---------
 gitweb/gitweb.css  |    5 +
 gitweb/gitweb.perl |  481 ++++++++++++++++++++++++++++++++++++++--------------
 2 files changed, 362 insertions(+), 124 deletions(-)