Hacking:Porting filters to GEGL/UI review

Reviewing UI&props of ported operations

GIMP filter	Menu group	GEGL operation	OK?	Test result	Comment
Antialias	Filters/Enhance	antialias	Yes	tested	OK
Deinterlace	Filters/Enhance	deinterlace	Yes	tested	OK. The operation got extra options: orientation and block size.
Supernova	Filters/Light & Shadow	supernova	No	tested	Center coordinates are defined in relative units, max radius has been changed to 3,000 from 1,000, seed option added to reproduce original renders
Lens Flare	Filters/Light & Shadow	lens-flare	No	tested	Center coordinates are defined in relative units
Drop Shadow	Filters/Light & Shadow	dropshadow	No	tested	Does not visibly affect layers, X/Y labels in sliders need to be changed to mention that the sliders control displacement, 'Allow resizing' feature from the original script is lost, opacity's max value is 2.0
Cell noise	Filters/Render/Noise	noise-cell	No	tested	UI makes mostly sense. 2 discrete step Rank value slider is odd, but tolerable
Perlin Noise	Filters/Render/Noise	noise-perlin	Yes	tested	OK
Plasma	Filters/Render/Noise	plasma	Yes	tested	OK
Simplex noise	Filters/Render/Noise	noise-simplex	No	tested	Scale value may need gamma to make the smaller scale factors (that make noise bigger) usable
Checkerboard	Filters/Render/Pattern	checkerboard	Yes	tested	OK
Grid	Filters/Render/Pattern	grid	Yes	tested	OK
Channel Mixer	Colours/Components	channel-mixer	Yes	tested	Fixed with custom UI. Monchrome mode functionality moved to Mono Mixer
Unsharp Mask	Filters/Enhance	unsharp-mask	No	tested	Parameters differ in naming and essence in OP, threshold parameter is totally missing.
Wind	Filters/Distorts	wind	No	tested	Left and right effect directions are mixed up