Tidied up and clarified code. Not sure why the source and target image options are needed but left them in.
Tidied up and clarified code.
Not sure why the source and target image options are needed but left them in.


BioMedIA/irtk-legacy,BioMedIA/IRTK,ghisvail/irtk-legacy,BioMedIA/IRTK,sk1712/IRTK,ghisvail/irtk-legacy,ghisvail/irtk-legacy,BioMedIA/IRTK,BioMedIA/irtk-legacy,ghisvail/irtk-legacy,sk1712/IRTK,BioMedIA/IRTK,BioMedIA/irtk-legacy,sk1712/IRTK,sk1712/IRTK,BioMedIA/irtk-legacy