revset: drop isinstance(baseset) from baseset.__and__ As baseset now has a fast __contains___ operator, this `baseset.set()` dance is no longer needed. No regressions are visible in the benchmark.

revset: use direct access to __contains__ in spanset.__sub__ Using `x.__contains__(r)` instead of `r in x` does not matter for built-in type (set) but have a positive impact for all other classes. This will let us drop some usage of baseset.set() in future patches. This also probably improves some performance.

revset: use a single return statement in matcher function This makes it easy to insert post processing and debug code on the returned value.

obsolete: replace "nb" notation with "num" (for "number") As requested by Matt Mackall.

shelve: remove unused status variables

gpg: use an abort hint and don't mention --force

gpg: move test of force before status call

gpg: drop unnecessary slicing of status array The call to repo.status() does not request status for clean files, so there is no reason to slice it out from the result. Leaving the tuple untouched will simplify a future change.