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. 723c31f Add "git_path()" and "head_ref()" helper functions. by Linus Torvalds · 20 years ago
2. 944d858 Fix up "for_each_ref()" to be more usable, and use it in git-fsck-cache by Linus Torvalds · 20 years ago
3. 8a65ff7 Generalize the "show each ref" code in receice-pack by Linus Torvalds · 20 years ago
4. 95fc751 [PATCH] Operations on refs by Daniel Barkalow · 20 years ago