Merge branch 'maint'

Merge branch 'maint'

* maint:
  GIT 1.5.0.3
  glossary: Add definitions for dangling and unreachable objects
  user-manual: more detailed merge discussion
  user-manual: how to replace commits older than most recent
  user-manual: insert earlier of mention content-addressable architecture
  user-manual: ensure generated manual references stylesheet
  user-manual: reset to ORIG_HEAD not HEAD to undo merge
  Documentation: mention module option to git-cvsimport