Tagging of r3964 to HM-14.0+RExt-7.0+SCM-1.0

The changes incorporated are 
- Intra block copy hash based full frame search 
- Hash based Inter search
- Bug fix for HM ticket #1281 in a backward compatible way (encoder only and controlled by macro)
- PSNR clipping as described in JCTVC-Q0053
- configuration files changes to align with Q1015 CTC for SCC
- configuration changes to emit PSNR clipping, MSE based sequence PSNR and FrameMSEOutput.