Copying float branch into default (apart from metadata tunneling, which oduis needs to re-enable n line 278 of simpleprocess.cc). I copied rtengine into default and patched things up, so this branch should have the rtgui of default and the rtengine of float.

rtgui/ppversion.h

@@ -0,0 +1,7 @@
+#ifndef _PPVERSION_
+#define _PPVERSION_
+
+// This number have to be incremented whenever the PP3 file format is modified
+#define PPVERSION 300
+
+#endif