*** RELEASE 2.0_beta3, 03 JUNE 2009 ***

Changes since beta2

CORE
 - Fix multi-thread bug related to vw_log()
 - Merged Logconf into Settings class
 - Simplify the config file handling by switching to an INI-syntax

IMAGE
 - Added a new version of edge_mask() that allows you to pick the mask value
 - Added sparse image support (SparseImageCheck, sparse_check())
 - Added the ability to specify some buffer around the edge mask.
 - Make the convolution filters properly clamp integer pixels.
 - Add an is_transparent() function for images
 - Added support in ImageResource for nodata values.

FILEIO
 - Fix some metadata handling bug in DiskImageResourcePNG
 - Make png writer pick a better bit depth for 16-bit types
 - Fixed an endianness bug for reading/writing 16-bit PNG files on little
   endian architectures.

CAMERA
 - Many improvements to Bundle Adjustment
   - Speed
   - KML Ground Control Point output has much more information and better
     regionation
   - TIFF EXIF tags are read by mmaping rather than reading the whole file

MOSAIC
 - Expose more aspects of QuadTreeGenerator to configuration/override.
 - Added TOAST QuadTreeGenerator support
 - Added full sparse image support to ImageComposite.

CARTOGRAPHY
 - Added a ToastTransform transform functor to convert between a standard
   georeferenced image and a TOAST-projected image.

STEREO
 - Added a constructor for PixelDisparity that allows it to be used with
   interpolation code.
 - Many improvements in BayesEM correlator
 - Switched upsample_disparity_map() to use bilinear interpolation instead of
   nearest neighbor
 - Fixed some bugs in the upsampling and downsampling of the disparity map

TOOLS
 - image2qtree bugfixes
 - Added an image2toast converter
 - Allow manual override of total resolution in image2qtree.

BUILD
 - Fix a bug in AX_GROUP_PKG that might cause breakage
 - Bash 4.0 doesn't include . in the "source" search path
 - Make out-of-tree builds work