New 2.1 version of x265

x265 version 2.1 has been released. This release contains experimental
support for slice-parallelism, enhancements to the API to support
user-defined SEI messages, and other bug fixes.

Full documentation is available at

Release Notes for 2.1

Encoder enhancements
1. Support for qg-size of 8
2. Experimental support for slice-parallelism.

API changes
1. Encode user-define SEI messages passed in through x265_picture object.
2. Disable SEI and VUI messages from the bitstream
3. Specify qpmin and qpmax
4. Control number of bits to encode POC.

Bug fixes
1. QP fluctuation fix for first B-frame in mini-GOP for 2-pass encoding
with tune-grain.
2. Assembly fix for crashes in 32-bit from dct_sse4.
3. Threadpool creation fix in windows platform.

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