Merge branch 'jn/gitweb-blame' into next

Merge branch 'jn/gitweb-blame' into next

* jn/gitweb-blame:
  gitweb: Create links leading to 'blame_incremental' using JavaScript
  gitweb: Incremental blame (proof of concept)
  gitweb: Add optional "time to generate page" info in footer
  gitweb: Add -partial_query option to href() subroutine
  gitweb: Use light/dark for class names also in 'blame' view
  gitweb: Add author initials in 'blame' view, a la "git gui blame"
  gitweb: Mark commits with no "previous" in 'blame' view
  gitweb: Use "previous" header of git-blame -p in 'blame' view
  gitweb: Mark boundary commits in 'blame' view
  gitweb: Make .error style generic