bunch of nodes reordered

clamp, min and max - moved to their own subfolder
all the type-conversion and color-correction nodes moved to
corresponding folders
duplicates removed
color to luminance float (grayscale) node created
adjustHSV node renamed to hsvOffset, clamping value bug fixed
similar hsvMult node added
all the transform nodes renamed to transformTo (since they don't allow
to select source space)
full transform nodes added
all transformation nodes moved to subfolder