osx: always purge build/mercurial before starting build This prevents stray files from previous builds from polluting newer builds.

osx: use more paranoid quoting in test

osx: install completion scripts using install(1) to avoid umask badness This actually fixes some tests that were showing us umask badness that had been overlooked.

merge with stable

py3: prove `hg {add,addremove,commit} all work We can't do a second commit in a repo yet, because pure-Python bdiff is broken on Python 3. That is probably a good next step.

revsetlang: perform quoting using ui.escapestr instead of repr() This changes one of the doctest results, but I'm pretty sure on inspection that it's an equivalent result.

revsetlang: add docstring with some tests to _quote

revsetlang: move quoting function to not be a closure I'm about to change the implementation here and I'd like to add some doctests, which means this needs to not be hidden inside another function.

revsetlang: portably bytestring-ify another pair of int() calls

checkcode: enforce lowercase for extension docstring title This will ensure new extensions are consistent and `hg help -e` has a consistent output. I have to add a new group since the normal "pypats" will be filtered by "pyfilters", which will remove comments and docstrings.