made $yast_modules a global hash of YastModule's

- sharing it among CLI and all instances of YastModule is confusing
- renamed to disambiguate from YCP namespaces
Commented out the obsolete `files` section.

It is left in to aid writing the `moves` section.

Command used:
grep -l ^files: data/*yml | xargs sed -i '/TODO: Process/d;/^$/d;s/^/#/'
Merge pull request #150 from mvidner/global-yast-modules

made $yast_modules a global hash of YastModule's
Merge pull request #151 from mvidner/comment-out-files

Commented out the obsolete `files` section.