Notes all_ in history. Goes to release 0.2.1.1.

Conflicts:
	xotl/ql/release.py
Merge branch 'release-0.2.1.1' into develop

Conflicts:
	xotl/ql/release.py
Removes invalid tests for removed operators
Defensively protects the dumb static analisys for the this_instance protocol.
Notices the dumbness of our static analysis
Improves references tables
Registers and compares PonyORM
Changes PonyORM to Pony
Updates the document status of Pony ORM comparison