GIT 0.99.7c

Contains the following post-0.99.7b fixes:

 - rsh.c string termination fix by H. Peter Anvin
 - further fetch fixes by Sergey Vlasov
 - diff-tree documentation by Robert Watson.
 - 'git diff --cached' synonymous to 'git diff --cached HEAD'.
 - subprocess.py licensing status clarification.

Signed-off-by: Junio C Hamano <junkio@cox.net>

1. 54c6870 Typofix: usage strings fix. by Junio C Hamano · 20 years ago
2. f976722 Add "git-patch-id" program to generate patch ID's. by Linus Torvalds · 20 years ago