A few more fixups to gitweb

I've applied most of the recent gitweb changes from the list
(except the one that processes gitweb.perl into gitweb.cgi, not
because I am opposed to it, but because merging it early would
make things a bit more inconvenient while many patches are in
flight on the list) and fixed up a few things I noticed.  I'll
be pushing out the results on "next" branch shortly, so if
people want to hack on gitweb further please base your changes
on this version (I am CC'ing this message to people who recently
worked on, or expressed interest in working on gitweb).

One thing to note.  Please make sure that you do not see
anything in Apache error log after you make your changes.  I do
not remember the details but kernel.org folks were very unhappy
earlier when gitweb spewed stuff into the error log, and if I
recall correctly things that output to the error stream were not
friendly to the http-server cache for some reason.

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