Ncam 9.7


-Rework on dvbapi to incrase the amount of descramblers
-Support for DVB-CISSA scrambling algorithm and 16 byte CWs
Get available descramblers in box and BISS2 related changes
* Instead of using a predefined number of descramblers (16 until now).
ncam now gets the exact number of available descramblers in box.
* Skip cw checks for BISS2, similar to what is done for BISS1. BISS2 uses 16 byte cw.
so some checks need to be skipped.
* Cosmetic changes including code refactoring, variable renaming and comment addition to several places.