Admin law panel fixes and enhancements

This resolves some deficiencies in the PP law toolkit for silicons.

 - Added remove button for each law (tested)
 - Removed buggy blank law behavior.  Blank laws are now ignored.
 - Added button to reset lawset to a standard one (e.g. asimov) (tested)
 - Cyborgs slaved to AI are notified of law change when Send Laws is used, and are also forced to sync.
 - Law changes refresh PP.
Merge pull request #2267 from N3X15/fix-lawtools

Admin law panel fixes and enhancements