ID#183, ID#185, ID#186:
* Consolidated tag registration into bootstrap.php. Maintained 2.1 tag registration model (separate tag per hierarchy for the moment).
* Removed dynamic tag registrations from tag implementations.
* Removed tag implementations where possible ATM. More consolidation to come.
Corrected comment.
ID#207: refactored tag to use dedicated model definition instead of super-generic attributes mapping.