merge with default, feature freeze for 1.3

--HG--
branch : stable
rest: fix typo, document default psy-rdoq value

--HG--
branch : stable
introduction.rst edited online with Bitbucket - added link to MPEG-LA
introduction.rst edited online with Bitbucket
analysis: missing braces caused a bug in CABAC context save for rd=2

--HG--
branch : stable
Merge with stable