bundle2: allow compression options to be passed to compressor Compression engines allow options to be passed to them to control behavior. This patch exposes an argument to bundle2.writebundle() that passes options to the compression engine when writing compressed bundles. The argument is honored for both bundle1 and bundle2, the latter requiring a bit of plumbing to pass the value around.

chg: check snprintf result strictly This makes the program more robust when somebody changes hgclient's maxdatasize in the future.

rebase: provide detailed hint to abort message if working dir is not clean Detailed hint message is now provided when 'pull --rebase' operation detects unclean working dir, for example: abort: uncommitted changes (cannot pull with rebase: please commit or shelve your changes first) Added tests for uncommitted merge, and for subrepo support verifying that same hint is also passed to subrepo state check.

revset: parse variable-length arguments of followlines() by getargsdict()

parser: extend buildargsdict() to support variable-length positional args This can simplify the argument parsing of followlines(). Tests are added by the next patch.

parser: make buildargsdict() precompute position where keyword args start This prepares for adding *varargs support. See the next patch.