tests/test-dispatch

dispatch: restore a dropped shlex import
Add test-dispatch as a place for command parsing and dispatch tests.

#!/bin/sh
# test command parsing and dispatch

hg init a
cd a
echo a > a
hg ci -Ama -d '0 0'

echo '% [defaults]'
hg cat a
cat > $HGRCPATH <<EOF
[defaults]
cat = -v
EOF
hg cat a