Update version and APIchanges.

Update libavformat/version.h and doc/APIChanges after renaming
init_put_byte() and ByteIOContext to ffio_init_context() (private)
and AVIOContext, (public), and deprecating the originals.
(cherry picked from commit d2bbf82e65e4a128ab1f0bf48df5d1e43c43c698)

doc/APIchanges

@@ -12,6 +12,12 @@ libavutil:   2009-03-08
 
 API changes, most recent first:
 
+2011-02-20 - e731b8d - lavf  52.102.0 - avio.h
+  * e731b8d - rename init_put_byte() to ffio_init_context(), deprecating the
+              original, and move it to a private header so it is no longer
+              part of our public API. Instead, use av_alloc_put_byte().
+  * ae628ec - rename ByteIOContext to AVIOContext.
+
 2011-02-16 - 09d171b - lavf  52.101.0 - avformat.h
                        lavu  52.39.0  - parseutils.h
   * 610219a - Add av_ prefix to dump_format().

libavformat/version.h

@@ -24,7 +24,7 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVFORMAT_VERSION_MAJOR 52
-#define LIBAVFORMAT_VERSION_MINOR 101
+#define LIBAVFORMAT_VERSION_MINOR 102
 #define LIBAVFORMAT_VERSION_MICRO  0
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \