rust: MissingAncestors.basesheads()
This new API method on `MissingAncestors` leverages directly the
Rust implementation for relative heads of a set, and also
lowers the cost of returning the results to Python in the context of
discovery.
These interchange costs can probably be further reduced by implementing
the `partialdiscovery` class in Rust, but that will be investigated in the
5.0 development cycle.
Differential Revision: https://phab.mercurial-scm.org/D5584
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
for software developers.
Basic install::
$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
Running without installing::
$ make local # build for inplace usage
$ ./hg --version # should show the latest version
See https://mercurial-scm.org/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.