Check versions of installed packages
Refactor has_package test for simpler version matching
Revert "Move strictures before any code (fix #472)"

This reverts commit ec7165ff8cdf1c7b89b0aad8a7b56061997fdde7.

Conflicts:
	lib/Rex/Fork/Task.pm
Use OurPkgVersion for automatic module versioning
Set minimum comment spacing to 1

This hepls avoiding perltidy warnings on VERSION strings inserted by
OurPkgVersion.