obsolete: os.SEEK_END first appeared in Python 2.5 fixes 48c232873a54 failing for Python 2.4

tests: convert a push test to use revsets

outgoing: accept revset argument for --rev There may be a more generic way that would add revset support to more commands by adding revset support to addbranchrevs(), but given the proximity of the next code freeze, a minimal change seems like the better choice.

dirstate: drop assert

dirstate: eliminate redundant check parameter on _addpath() state == 'a' implies check I fail to see what the point of this check parameter is. Near as I can see, the only _addpath call where it was set to True was in add(), but there, state is 'a'. This is a follow-up to c2016bae3b97.

obsolete: add seek to end of file before calling tell (issue3543)

peer: remove cancopy from peer api; use directly on repo instead