Git 1.6.6.3

1. aa8dc96 Documentation: undocument gc'd function graph_release() by Greg Price · 16 years ago
2. 064bfbd graph.c: make many functions static by Nanako Shiraishi · 17 years ago
3. 7528f27 log --graph --left-right: show left/right information in place of '*' by Adam Simpkins · 18 years ago
4. c12172d Add history graph API by Adam Simpkins · 18 years ago