- Delta POC MSB needs to be coded relative to previous value.  See draft text equation (151).
  - Delta POC MSB is not used correctly in constructRefPicList( ).
  - Delta POC MSB is not used at all in several other places.

to align coding style

Fix #851 : fix rpl_sps_flag[1] and rpl_idx[1] inference in case rpl1_idx_present_flag = 0 (in both SH and PH).

Also use correct default values for JVET_Q0819_PH_CHANGES related flags in Slice.cpp

- don't use SPS in PPS parsing/writing
- create a function for decoder parameter set consistency checks
- fix bug with JVET-Q0413 subpicture parsing changes
- may contain traces of coding style fixes

For independent layers, use POC MSB cycle signalling. In the SPS, there is a flag to control whether picture header has ph_poc_msb_cycle_present_flag, and a length in the SPS. When ph_poc_msb_cycle_present_flag is equal to 1, the POC MSB cycle, u(v) coded, is signalled in the picture header. When POC MSB cycle is present, the POC MSB of the picture is set to poc_msb_cycle * MaxPicOrderCntLsb.

Modifications to VPS syntax (signal PTL for single layer OLSs)
PTL part only (HRD part to be implemented by Sharp)

Bug fix for loop filter initialization when min CU size is not 4; changed intra chroma minQT size in software to luma unit

Checking condition is substituted by helper function isLumaScalingList(). Also the constants are ZZmodified into the
exsiting macro.

Checking condition is substituted by helper function isLumaScalingList(). Also the constants are ZZmodified into the
exsiting macro.

Implementation of JVET-Q0468 support of min Luma coding block size, and JVET-Q0469 for Intra Chroma Min QT bug fix

Add checks to ensure that the number of signalled WP is not less than the number of active ref pics