also improve non-half-int interpolation performance
raster/vector.c: use new stripf() func in "common.c" to workaround gcc
32-bit float calculation variations
gs1.c: allow dummy AI "[]" if GS1NOCHECK_MODE and has data (#204);
also add note re TPX AI 235 and terminating FNC1
Remove trailing whitespace in various files
Correct fault which led to wrong bytecount - multiple declarations of font not needed
Also included HeaderExtension1 and HeaderExtension2 objects for better compatability with GDI
As suggested by Alex Roy in #185
