[PATCHv4] git-p4: RCS keyword handling

Updated patch incorporating comments from Pete and Junio to handle RCS keyword expansion in git-p4.

Note: The current patch fails to to handle the case where a user
adds an expanded RCS keyword in *git* (e.g. via cut-n-paste).
I'll try to address that separately. There's a failing test case
for this.

This version:

 - uses "p4 fstat" to get the filetype
 - uses Junio's suggested regexp to match $Keyword:$
 - uses the sets of added/deleted files rather than parsing diff output
 - various other small fixes spotted by Pete
 - adds additional test cases

Luke Diamand (1):
  git-p4: add initial support for RCS keywords

 Documentation/git-p4.txt   |    5 +
 contrib/fast-import/git-p4 |  118 ++++++++++++--
 t/t9810-git-p4-rcs.sh      |  388 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 501 insertions(+), 10 deletions(-)
 create mode 100755 t/t9810-git-p4-rcs.sh