this is the most up to date version of the module and is what PCM is currently using. If MNN ever upgrades their version of the module (the 2.x branch) they would start with this version to eliminate the fork.
This version of the module is what is currently in production use for MNN. While still relying on the same underlying structure, the module has gone through some drastic changes, including many user interface additions that make viewing and altering the schedule much easier through javascript. Nobody other than MNN has moved from the 1.x version to the 2.x version so the upgrade path is currently unknown.