merge with stable

util: fix bad variable use in bytecount introduced by f0f7f3fab315

acl: 'util.never' can be used instead of a more complex expression

acl: perform some computations earlier, so that returned lambda functions are simpler

acl: added some comments to easily identify branch- and path-based verifications

acl: 'util.never' used

acl: cleanup

revlog: don't handle long for revision matching The underlying C code doesn't support indexing by longs, there are no legitimate reasons to use a long, and longs should generally be converted to ints at a higher level by context's constructor.

merge with stable

context: grudging accept longs in constructor