Add message to test output if a test is aborted due to a timeout.
Without this an aborted test could produce an empty .err file so the diff
looks like as if all lines of the .out files are just missing for some unknown
reason.
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.