Remove variable output affected by length of TMPDIR.
If the temporary directory is longer than /tmp then it's possible that
the Subject line will get wrapped by the headencode function.
Basic install:
$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
See http://mercurial.selenic.com/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.