Fix debugbitstream functionality

Fabrice URBANrequested to merge
(removed):fix_debugbitstream into master

these 2 fixes solve debugbitstream functionality:

  • missing codingstructure initialization in tryDecodePicture (fix for MR !525 (merged))
  • clean pu::ipredIdx (fix for MR !518 (merged)) This is a bit-accurate modification for CTC configurations
Edited by Fabrice URBAN

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