Lower severity for trailing comments
Fix no method error

when $styles section for policy don't exist
Documnetation for Numbered class
Add GLI_DEBUG for exit_now!
Move @lines parsing to Parser class

Where it belongs
POD comments module

POD comments included into standard parser as module.  It recognizes comments
in POD here-doc style and moves them from code part to comments.

For Numbered class:
- method slice
- method sort
Policy to check percetantage coverage of the comments over code
Use of active = false

By using false on active default allow disabling policies.
Fix NaN - divizion by 0n comment coverage