Fixed tests for stash and config
Use L::HM::Paths to locate lixuz-sendmail.pl
Added a fallback for when $LIXUZ::PATH is undef

This can be when it is being executed from a script that runs without first
loading LIXUZ. The fallback uses its own known path as a base and tries to
locate the root from there.
Added a Version module to fetch the Lixuz version

It does its best to always return the version number, even when LIXUZ
is not loaded.