mdiff: replace wscleanup() regexps with C loops
On my system it reduces:
hg annotate -w mercurial/commands.py
from 36s to less than 8s, to be compared with 6.3s when run without whitespace
options.
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
for software developers.
Basic install:
$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
See http://mercurial.selenic.com/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.