renamed png functions
multiply overflow fixes
fixed leaking file descriptors (spritetool)
Merge branch 'compact_record'
minor speedups/bugfixes
bugfixes, parametrized image algorithm in record device
bugfixes in png speed optimization
png speed improvement draft
compress images in record device
fixed compiler warning
improved png compression
improved png compression
fixed format warnings
fixed leaking file descriptors
corrected bpp alignment during saving
improved k-means speed
lrand48() -> rand()
added EXPORT to public functions
don't use filtermodes>0
added support for palette images