Merge branch 'jc/pack-reuse'

Merge branch 'jc/pack-reuse'

* jc/pack-reuse:
  git-repack: allow passing a couple of flags to pack-objects.
  pack-objects: finishing touches.
  pack-objects: reuse data from existing packs.
  Add contrib/gitview from Aneesh.
  git-svn: ensure fetch always works chronologically.
  git-svn: fix revision order when XML::Simple is not loaded
  Introducing contrib/git-svn.
  Allow building Git in systems without iconv