AVL62X1 Firmware 1.8.29209

Feature release:

1. add short frame support to AVL6261C

AVL62X1 Firmware 1.8.28971

This is a maintenance release with the following changes:

1. Improved stability
2. Improved threshold performance
3. T2MI parsing improvements
4. Add S2X capability to AVL6221A

AVL62X1 Firmware 1.8.27679

This is a maintenance release with the following changes:

1. improve automatic PL scrambling detection on Eutelsat 5W et al
2. improve acquisition reliability when there are multiple adjacent narrow carriers
3. improve acquisition reliability for narrow carriers with very low SNR
4. fix bug where the reported roll-off factor was sometimes incorrect
5. add support for 25MHz reference clock