REL: set version to 1.5.1.

REL: set version number to 1.5.1rc2 and set released=True.

Tag first RC for 1.5.1

REL: set version to 1.5.0, released=True.

REL: set version to 1.5.0rc1, released=True.

REL: set version to 1.5.0b2, and add 3.1 superpack to release script.

REL: Set version to 1.5.0b1, released = True.

REL: Set version to 1.4.1.

REL: update Changelog start and end points.

Add 1.4.1 release notes.