Deepgbtrevision

v14:

• re-synced to gbt-fpga sources to remove unnecessary changes
• re-synced to mp7 2.4.0 and then update to mp7 2.4.3
• gbt-fpga sources updated to 6.1.0
• disable 2 unneded gbt link sub-modules
• code cleanup

This version seems to behave better in terms of random phase changes