giving feedback even if no invalid samples were found
if dump flag is set, also a binary dump of all samples is dumped.

TODO: include width and height
also writing size & spp to dump, included script for reading dump

untested though
fixed comparison in < operator of SampleData

This could have lead to samples not being ordered the same way every time
renamed jkl_dump_rpf binary, small naming fix for read_dump
updated makefile to compile read_dump
dumping now also indirect via read_lehtinen_dump
some cleanup for preprocess function and bugfix previous commit
Merge branch 'master' into per_channel_alpha
moved RANDOM_PARAMETERS to cpp file

and some typos *cough*