Merge branch 'lt/web'

* lt/web:
  gitweb: tree view: hash_base and hash are now context sensitive
  gitweb: History: blob and tree are first, then commitdiff, etc
  gitweb: Remove redundant "commit" from history
  gitweb: Don't use quotemeta on internally generated strings
  gitweb: Add snapshot to shortlog
  gitweb: Factor out gitweb_have_snapshot()
  gitweb: Remove redundant "commit" link from shortlog
  gitweb: "alternate" starts with shade (i.e. 1)
  gitweb: Add history and blame to git_difftree_body()
  gitweb: Remove excessively redundant entries from git_difftree_body
  Revert "gitweb: extend blame to show links to diff and previous"
  gitweb: Quote filename in HTTP Content-Disposition: header
  gitweb: Add git_url subroutine, and use it to quote full URLs
  gitweb: Split validate_input into validate_pathname and validate_refname
  gitweb: Use "return" instead of "return undef" for some subs
  gitweb: Strip trailing slashes from $path in git_get_hash_by_path
  gitweb: extend blame to show links to diff and previous
  gitweb: Remove redundant "tree" link
  gitweb: tree view: eliminate redundant "blob"