Bump version number to 0.001_002 after release.
Minor doc/comment improvements.
Prevent potential double-loading of modules.
Note double-loading prevention in Changes.
Test double-loading prevention.
Move test module SubFind.pm to Sub/Find.pm to better test package search.
Update contents to match SubFind -> Sub/Find move.
Test double-loading prevention with package containing "::" in name.
Document dobule-load prevention.
Add comments to complex "find package name" code.
Bump version after release.