Merge branch 'ab/gitweb-abbrev-links'

In addition to purely abbreviated commit object names, "gitweb"
learned to turn "git describe" output (e.g. v2.9.3-599-g2376d31787)
into clickable links in its output.

* ab/gitweb-abbrev-links:
  gitweb: link to "git describe"'d commits in log messages
  gitweb: link to 7-char+ SHA-1s, not only 8-char+
  gitweb: fix a typo in a comment

diff --cc gitweb/gitweb.perl
Simple merge