[master] Bump to version 1.4.3beta01

ANNOUNCE

@@ -1,51 +1,32 @@
 
-Libpng 1.4.2 - May 6, 2010
+Libpng 1.4.3beta01 - May 14, 2010
 
-This is a public release of libpng, intended for use in production codes.
+This is not intended to be a public release.  It will be replaced
+within a few weeks by a public version or by another test version.
 
 Files available for download:
 
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   libpng-1.4.2.tar.xz (LZMA-compressed, recommended)
-   libpng-1.4.2.tar.gz
-   libpng-1.4.2.tar.bz2
+   1.4.3beta01.tar.xz (LZMA-compressed, recommended)
+   1.4.3beta01.tar.gz
+   1.4.3beta01.tar.bz2
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lpng142.zip
-   lpng142.7z
+   lp143b01.zip
+   lp143b01.7z
 
 Other information:
 
-   libpng-1.4.2-README.txt
-   libpng-1.4.2-LICENSE.txt
+   1.4.3beta01-README.txt
+   1.4.3beta01-LICENSE.txt
 
-Changes since the last public release (1.4.1):
-  Restored the macro definition of png_check_sig().
-  Conditionally compile an "else" statement in png_decompress_chunk().
-  Documented the fact that png_set_dither() was disabled since libpng-1.4.0.
-  Reenabled png_set_dither() but renamed it to png_set_quantize() to reflect
-    more accurately what it actually does.  At the same time, renamed
-    the PNG_DITHER_[RED,GREEN_BLUE]_BITS macros to
-    PNG_QUANTIZE_[RED,GREEN,BLUE]_BITS.
-  Added some "(long)" typecasts to printf calls in png_handle_cHRM().
-  Relaxed the overly-restrictive permissions of some files.
-  Added the "vstudio" project to replace "visualc6" and "visualc71" which
-    will be removed from libpng-1.5.0.
-  Demonstrate in example.c that lang_key should be initialized.
-  Set PNG_NO_READ_BGR, PNG_NO_IO_STATE, and PNG_NO_TIME_RFC1123 in
-    contrib/pngminim/decoder/pngusr.h to make a smaller decoder application.
-  Include png_reset_zstream() in png.c only when PNG_READ_SUPPORTED is defined.
-  Removed dummy_inflate.c and uncompr.c from contrib/pngminim/encoder
-  Corrected PNG_UNKNOWN_CHUNKS_SUPPORTED to PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-    in gregbook/readpng2.c
-  Corrected protection of png_get_user_transform_ptr. The API declaration in
-    png.h is removed if both READ and WRITE USER_TRANSFORM are turned off
-    but was left defined in pngtrans.c
-  Moved declarations of umsg[] inside the proper #ifdef blocks in pngrutil.c
+Changes since the last public release (1.4.2):
+
+version 1.4.3beta01 [May 14, 2010]
 
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