obsolete: add a high level function to create an obsolete marker
This function is designed to be used by all code that creates new
obsolete markers in the local repository.
It is not used by debugobsolete because debugobsolete allows the
use of an unknown hash as argument.
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 http://mercurial.selenic.com/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.