MultiRepos: merged from 0.12dev [7852:7875/trunk]
Documentation update from t.e.o's wiki for 0.12 TracGuide
0.12dev: ported r7870 and r7872 documentation updates from 0.11-stable
0.12dev: ported r7865 from 0.11-stable
0.11-stable: Documentation update from t.e.o's wiki.
0.12dev: prevent r7859 from being backported to trunk.
Documentation update from t.e.o's wiki for 0.11 TracGuide
trunk: Merged [7868] from 0.11-stable.
A cleaner and slightly more efficient solution to #4987.
trunk: Merged [7866] from 0.11-stable.