New L1_gFexDataTowers collection (output of BS Decoder) and L1_gFexEmulatedTowers (output of new gFexTowerBuilder)
produce new 'fiber' gfex datatowers, which will eventually be the only data tower collection the bs decoder produces, with the other two containers (datatowers200 and datatowers50) to be produced by a separate gFexTowerSummer algorithm, to be delivered soon
We also add a new gFexTowerBuilder that creates the emulatedTowers to mirror the new dataTowers