commands: Add 'hg log --branch' and deprecate 'hg log --only-branch'
Switching to --branch makes log consistent with push/pull and make more sense
given the actual behavior of the option (you can specify -b multiple times to
include multiple branches).
This change also adds some tests for 'hg log -b'.
% test multiple merges at once
initializing destination source-hg repository
scanning source...
sorting...
converting...
4 Initial add
3 Added branch1 file
2 Added parent file
1 Added brach2 file
0 Merged branches
o 5 "(octopus merge fixup)" files:
|\
| o 4 "Merged branches" files: file-branch2
| |\
o---+ 3 "Added brach2 file" files: file-branch2
/ /
| o 2 "Added parent file" files: file-parent
| |
o | 1 "Added branch1 file" files: file file-branch1
|/
o 0 "Initial add" files: file
% manifest of tip
644 file
644 file-branch1
644 file-branch2
644 file-parent