heads: show closed heads only when --closed is passed
Add a --closed (-c) option to 'hg heads' to show all heads and change the
default behavior to refrain from showing fully closed branches.
Enhance 'hg heads <branch>' so that:
* default: displays normal & inactive heads, not closed heads
* --closed: displays normal, inactive & closed heads
* --active: displays only normal heads
* both --closed and --active: displays normal & closed heads only
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.