obslog: colorize the description diff shown in obslog -p
This patch colorizes the description diff shown in `hg obslog -p`. The labels
for the header are different from that of the patch as the main header which
says `diff -r <somehash> -r <somehash> <filename>`. Next patch will hack to add
that.
syntax: re
/figures/[^/]+\.png$
^html/
\.pyc$
~$
\.swp$
\.orig$
\.rej$
^tests/.*\.err$
^tests/easy_run.sh$
^build/
^dist/
^MANIFEST$
^docs/tutorials/.*\.rst$
\.ico$
tests/\.testtimes
^docs/training/graphs/
^docs/training/html/
^docs/training/index.html
^docs/training/graphviz-images/
^docs/training/img/
^docs/training/output/
^docs/training/pandocfilters/