Martin Geisler <mg@aragost.com> [Tue, 01 Mar 2011 17:01:17 +0100] rev 13519
tests: don't overwrite HGRCPATH
Overwriting instead of appending to the file removes the [defaults]
section put into the file by run-tests.py.
It also defeats the --inotify option to run-tests.py.
(Nothing was broken yet, but the lack of -d "0 0" cause changeset
hashes to change unexpectedly in a test case I was editing.)