Updated NEWS; added stddef.h for size_t

I thought size_t is defined in stdlib.h, but it is not always.

NEWS

@@ -1,3 +1,39 @@
+Release 0.7.1 (8 March, 2013)
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Changes to BWA-MEM:
+
+ * Bugfix: rare segmentation fault caused by a partial hit to the end of the
+   last sequence.
+
+ * Bugfix: occasional mis-pairing given an interleaved fastq.
+
+ * Bugfix: wrong mate information when the mate is unmapped. SAM generated by
+   BWA-MEM can now be validated with Picard.
+
+ * Improved the performance and accuracy for ultra-long query sequences.
+   Short-read alignment is not affected.
+
+Changes to other components:
+
+ * In BWA-backtrack and BWA-SW, replaced the code for global alignment,
+   Smith-Waterman and SW extension. The performance and accuracy of the two
+   algorithms stay the same.
+
+ * Added an experimental subcommand to merge overlapping paired ends. The
+   algorithm is very conservative: it may miss true overlaps but rarely makes
+   mistakes.
+
+An important note is that like BWA-SW, BWA-MEM may output multiple primary
+alignments for a read, which may cause problems to some tools. For aligning
+sequence reads, it is advised to use `-M' to flag extra hits as secondary. This
+option is not the default because multiple primary alignments are theoretically
+possible in sequence alignment.
+
+(0.7.1: 8 March 2013, r347)
+
+
+
 Beta Release 0.7.0 (28 Feburary, 2013)
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

bwt.h

@@ -29,6 +29,7 @@
 #define BWA_BWT_H
 
 #include <stdint.h>
+#include <stddef.h>
 
 // requirement: (OCC_INTERVAL%16 == 0); please DO NOT change this line because some part of the code assume OCC_INTERVAL=0x80
 #define OCC_INTV_SHIFT 7