Update NEWS for 5.1.3alpha.
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XZ Utils Release Notes
======================
+5.1.3alpha (2013-10-26)
+
+ * All fixes from 5.0.5
+
+ * liblzma:
+
+ - Fixed a deadlock in the threaded encoder.
+
+ - Made the uses of lzma_allocator const correct.
+
+ - Added lzma_block_uncomp_encode() to create uncompressed
+ .xz Blocks using LZMA2 uncompressed chunks.
+
+ - Added support for native threads on Windows and the ability
+ to detect the number of CPU cores.
+
+ * xz:
+
+ - Fixed a race condition in the signal handling. It was
+ possible that e.g. the first SIGINT didn't make xz exit
+ if reading or writing blocked and one had bad luck. The fix
+ is non-trivial, so as of writing it is unknown if it will be
+ backported to the v5.0 branch.
+
+ - Made the progress indicator work correctly in threaded mode.
+
+ - Threaded encoder now works together with --block-list=SIZES.
+
+ - Added preliminary support for --flush-timeout=TIMEOUT.
+ It can be useful for (somewhat) real-time streaming. For
+ now the decompression side has to be done with something
+ else than the xz tool due to how xz does buffering, but this
+ should be fixed.
+
+
5.1.2alpha (2012-07-04)
* All fixes from 5.0.3 and 5.0.4
