Refactor t/vstrings.t
Make EUMM prereqs work minus version-range if no CPAN::Meta::Requirements
Merge pull request #174 from mohawk2/cmrfallback

Make prereq-handling still work (minus version-range) if no CMR
t/prereq.t labels on all tests
Revert LibList to a working state

Recent work on Liblist has resulted in an endless stream of fixes and fixes upon those fixes and fixes upon fixes upon those fixes.

* The only additional tests are testing garbage-in garbage out, not something useful.
* They are reporting spurious warnings to the end-users about said garbage
* I currently broken, and has been broken for other reasons before

I'm reverting it to the latest state that was known to be working without issues.
Localise $_ in run_test to avoid problem for purify_makefile branch