branching: merge with stable format source worked smoothly :-)

python3: use format-source to run byteify-strings in .py files Using the format-source extension smooth out the pain of merging after auto-formatting. This change makes all of the Evolve test suite pass under python3 and has added benefit of being 100% automated using mercurial's `byteify-strings` script version 1.0 (revision 11498aa91c036c6d70f7ac5ee5af2664a84a1130). How to benefit from the help of format-source is explained in the README.

topic: add a new random attribute (This is mostly an excuse to test the format-source setup)

python3: enforce byte prefix for vfs.open() Changeset ea8da5aa23c6e723d7f0006387a1a20eef58fc9a added raw prefix to open(), but also to vfs.open(). The latter only handles bytestring arguments.

python3: add raw prefix to sqlite isolation level

python3: add ignore block around python 2 compatibility if branch

flake8: silence F633 error

python3: add raw prefix to edge-cases kwargs-like objects

python3: add raw prefix to open()-like functions

python3: add raw prefix to all array.array() calls

python3: add raw prefix to "troubles"-related dicts The `byteify-strings.py` script cannot know that these will be used in a way that requires to use a system string without some pretty hardcore hardcoding.

python3: add raw prefix in cases harder to analyze at the token level The `byteify-strings.py` script would be a lot more complicated if it had to do backtracking and other more advanced static analysis to figure our those cases, so we have to add the raw prefix to those cases manually.

python3: add byte prefix for objects that look like kwargs but aren't The `byteify-strings.py` script has no way of knowing that those aren't acutally kwargs since it works purely at the tokenization level, so we have to add the byte prefix to their keys manually.

python3: mark all SQL queries as raw strings

python3: prefix all regex to work with python 2 and 3

pick: added support for hg abort This patch isolates abort logic for `hg pick --abort` as `abortpick()`. For independent calls via `hg abort` `hgabortpick()` is created and registered to the state detection API. Results are shown as tests.