Merge branch 'master' of git://repo.or.cz/git/fastimport

Merge branch 'master' of git://repo.or.cz/git/fastimport

* 'master' of git://repo.or.cz/git/fastimport: (81 commits)
  S_IFLNK != 0140000
  Don't do non-fastforward updates in fast-import.
  Support RFC 2822 date parsing in fast-import.
  Minor fast-import documentation corrections.
  Remove unnecessary null pointer checks in fast-import.
  Correct fast-import timezone documentation.
  Correct minor style issue in fast-import.
  Correct compiler warnings in fast-import.
  Remove --branch-log from fast-import.
  Initial draft of fast-import documentation.
  Don't support shell-quoted refnames in fast-import.
  Reduce memory usage of fast-import.
  Include checkpoint command in the BNF.
  Accept 'inline' file data in fast-import commit structure.
  Reduce value duplication in t9300-fast-import.
  Create test case for fast-import.
  Support delimited data regions in fast-import.
  Remove unnecessary options from fast-import.
  Use fixed-size integers when writing out the index in fast-import.
  Always use struct pack_header for pack header in fast-import.
  ...