gitweb: Make use of $PATH_INFO for project parameter
gitweb: Make use of $PATH_INFO for project parameter

Allow to have project name in the path part of URL, just after the name of
script. For example instead of gitweb.cgi?p=git.git you can write
gitweb.cgi/git.git or gitweb.cgi/git.git/

Not used in URLs inside gitweb; it means that the above alternate syntax
must be generated by hand, at least for now.

Side effect: project name parameter is now stripped of leading and
trailing slash before validation.

Signed-off-by: Jakub Narebski <a6a1517a087f9f64a72f41a0de57ff01fbb0e412@gmail.com>
Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git