test-help: improve test coverage
Adds a test for using the help option with the version option.
Extends test coverage of commands.help_ by another 2 lines.
#!/bin/sh
mkdir t
cd t
hg init
echo a > a
hg add a
hg commit -m test -d "1000000 0"
rm .hg/requires
hg tip
echo indoor-pool > .hg/requires
hg tip
true