Merge branch 'gl/cleanup' into gl/cleanup-next

Merge branch 'gl/cleanup' into gl/cleanup-next

* gl/cleanup: (160 commits)
  Convert memset(hash,0,20) to hashclr(hash).
  Convert memcpy(a,b,20) to hashcpy(a,b).
  Fix a comparison bug in diff-delta.c
  git-send-email: Don't set author_not_sender from Cc: lines
  Remove unnecessary forward declaration of unpack_entry.
  Verify we know how to read a pack before trying to using it.
  Add write_or_die(), a helper function
  Axe the last ent
  builtin-mv: readability patch
  git-mv: fix off-by-one error
  git-mv: special case destination "."
  builtin-mv: readability patch
  Indentation fix.
  Do not use memcmp(sha1_1, sha1_2, 20) with hardcoded length.
  gitweb: Uniquify version info output, add meta generator in page header
  Be nicer if git executable is not installed
  builtin-grep: remove unused debugging cruft.
  gitweb: Add support for per project git URLs
  [PATCH] git-mv: add more path normalization
  Remove the "delay writing to avoid runtime penalty of racy-git avoidance"
  ...