pfstools 1.8.3 released

This realease brings an updated "pfsview", which is now 100% QT4
application. Some cosmetic problems as well as "Fit window to content"
have been fixed. Other minor fixes are listed below.

* fixed: pfsdisplayfunction properly interpolates display LUT
* fixed: bug #3080304 - configure uses non-portable test(1) syntax
* fixed: bug #1766263 - pfsinhdrgen fails silently on pfsin failure. - partially
* fixed: pfsview the entire code converted from qt3 to qt4 (fixes bug #3127946)
* fixed: "Fit window to content" works again in pfsview
* added: window icon in pfsview
* added: improved image file saving in pfsview