[ptx] libpano12-2.8.1 released

[Bruno Postle]

Version 2.8.1 of libpano12 has been released:

http://sourceforge.net/project/showfiles.php?group_id=96188&package_id=132440

This release contains many small bugfixes and a number of useful new 
features.

Changes since 2.8.0
===================

Four new projection types have been added (Pablo d'Angelo)

* Stereographic (use f4 in the 'p-line')

* Mercator (use f5 in the 'p-line')

* Transverse mercator (use f6 in the 'p-line')

* Sinusoidal (use f7 in the 'p-line')

http://www.panotools.info/mediawiki/index.php?title=Projections

These work with existing versions of PTStitcher, PTmender and the
upcoming hugin-0.6.

Support for radiance 32bit float .hdr files (Thomas Rauscher)

A new API allows application developers to optionally supply their 
own callback functions for error and progress reporting (Pablo
d'Angelo).

The release includes version 0.4.0 of PTmender and PTblender
with some new features:

* Flattened TIFFs (Daniel M. German)

* JPEG and PNG output (Daniel M. German)

* Cropped TIFF output files (use n"TIFF_m r:CROP" in the 'p-line', Max Lyons)

* LZW compressed output (use n"TIFF_m c:LZW" in the 'p-line', Max Lyons)