Fix #218- Cleans up metadata table handling.

Including not trying to drop it when generating ModyllicSQL, and also
handling orphaned metadata sanely.
Fix 'HASH' type reserved word
Merge pull request #220 from iarna/bareword-not-reserved

Fix 'HASH' type reserved word
Merge pull request #219 from iarna/metatable-fixes

Fix #218- Cleans up metadata table handling.
Fix 5.2 compatibility issues
Merge pull request #221 from iarna/metatable-fixes

Fix 5.2 compatibility issues
s/clone_from/copy_from/
Merge pull request #222 from iarna/clone_from-rename

s/clone_from/copy_from/
copy_from is not a static method any more
Warn rather then crash if a database doesn't exist
Fix migration from SQLMETA to MODYLLIC
Fix bug in determining differences
Merge pull request #223 from iarna/misc-fixes

Misc fixes
Pirum update now has packages.json
Merge branch 'upstream-wiki'
Release Modyllic-0.2.10
Release Modyllic-0.2.10
'declare' the metadata variable
Merge branch 'upstream-wiki'
Release Modyllic-0.2.11