tests/helper-runtests.sh

test-copies: improve description of the C+H case

This will make its role clearer.

Differential Revision: https://phab.mercurial-scm.org/D10045

#
# Avoid interference from actual test env:

unset HGTEST_JOBS
unset HGTEST_TIMEOUT
unset HGTEST_PORT
unset HGTEST_SHELL