rd level: change the indexing for sa8d threshold array

The index in threshold array won't be same as depth when the max cu size is less than 64.
rd level: remove the redundant splitflag bit calculation with EARLY EXIT ON
rd level: fix the incorrect cost calculation for sa8d

In rd level 1, the distortion is sa8d, so cost calculation should be calrdsadcost() instead of calcrdcost()
compress: review/clean up merge
compress: review/clean up top_skip
Merge: changes outputs
Fix for deltaWeight assert failure in Decoder
rc: Initialize virtual qps till 69
rc: implement ratecontrol upto  MAX_MAX_QP.

For RateControl .virtual qps are used from 0 till 69. Howevr,Before encoding the frame,
the qps are clipped back to 51