Removed code that will never be executed.
search: do not skip intra tu 32x32 unless TU intra depth is deep (refs #71)

This may not be the best workaround for the bug, and needs a proper long term
fix.

--HG--
branch : stable
Merge with stable
search: nit
encoder: do not allow scaling lists to be used with 4:4:4 color space (refs #72)

It causes hash mistakes

--HG--
branch : stable
extra : amend_source : 4f5a265489b9f66bfb28ecea6f9567167e34d7bd
Merge with stable
encoder: nit, remove obsolete comment