pick: added support for hg abort
This patch isolates abort logic for `hg pick --abort`
as `abortpick()`. For independent calls via `hg abort`
`hgabortpick()` is created and registered to the state
detection API.
Results are shown as tests.
# utility to setup pythonpath to point into the tested repository
export SRCDIR="`dirname $TESTDIR`"
if [ -n "$PYTHONPATH" ]; then
export HGTEST_ORIG_PYTHONPATH=$PYTHONPATH
if uname -o | grep -q Msys; then
export PYTHONPATH="$SRCDIR;$PYTHONPATH"
else
export PYTHONPATH=$SRCDIR:$PYTHONPATH
fi
else
export PYTHONPATH=$SRCDIR
fi