add a blame alias for annotate
The original cvs command was called blame. SVN has both, and other VC systems
typically also have this as an alias. Makes things easier for converts.
Basic install:
$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
See http://www.selenic.com/mercurial/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.