PRICE - image filtering and manipulation Code

make initial view actually 255x255

draw curves after histograms, so that they don't overlap

correctly move control points of black point

take in account of scaled values when setting white and black point

properly inverse transform before getting the black and white points

code cleanup

make Curves View resizable, enhance CurvesPath so they can resie with the view and remain editable

allow auto-sizing of the view, even if it still breaks display

highligh current curve

use pre-allocated colors for drawing