tests: fix unused imports from inotify removal caught by pyflakes

revset: added ordered generatorset classes with __contains__ method They stop iterating as soon as they go past the value they are looking for, so, for values not in the generator they return faster.

merge: use the right ancestor when both sides copied the same file The tests shows no real changes because of this ... but there must be some weird corner cases where using the right ancestor for the merge planning is better than using the wrong one.

copies: when both sides made the same copy, report it as a copy Not used yet ... but shows up in debug output.

merge: handle create+delete prompts in calculateupdates I would like to move it all the way to the interactive resolve state like merges are ... but this is a first intermediate step.

merge: handle acceptremove of create+delete early in manifest merge

largefiles: override calculateupdates instead of manifestmerge That will give calculateupdates a purpose in life ... and be convenient later.

tests: add systematic test of merge ancestor calculation There is probably some overlap with the existing tests - it is hard to figure out what these tests are doing.

tests: add test case for criss cross merge The test do not fit in any existing test file...

merge with stable

revset: changed generatorset code to remove unnecesary function call Removed _nextitem() method, now __iter__ has that logic and __contains__ uses __iter__ to check for membership.

phase: say "Returns 0" instead of "Return 0" like other command help

dirstate: remove double imports of errno

cmdserver: mask return code of runcommand in the same way as dispatch.run "hg help" does not state that the code for abort is 255, but it's confusing to have different code between hg command and command server. Tests of python-hglib 1.2 passed with this change.