Change computation of bounds for window/level (handle negative values)
Change composite param to use QHash to set values (was buggy before)
Remove useless qdebugs
Solves the problem of window level using the sliders with images having small value ranges
Window limited to 0 everywhere
Correct number of decimals shown based on current step
Correct WL transmission bug between 3d and 2d view
Correct zooming bug in 3d mode
Levels are not constrained by image values anymore
Merge pull request #157 from ocommowi/wl-composite-bug-correction

WL composite bug correction