pfstools 1.6 released

The new release is equipped with a preliminary binding to
matlab. Images can be read, written and displayed with pfsview using
matlab functions. Improved image readers / writes can to load LDR
images with the alpha channel. Those that do not like QT can use
OpenGL HDR viewer - pfsglview (does not requires X Window client under
Win32). Finally, several compatibility and compilation issues have
been resolved.