2009.01.01 v.5.8
+ Visual feedback for brightness/contrast/color edits was made faster by
using the window image instead of the (usually much larger) main image.
The main image is updated when the changes are committed.
+ Erratic mouse drag in warp function was fixed.
+ Color balance was separated from brightness/whiteness adjustments.
+ Bug fix: last translation in a .po file sometimes got comment appended.
+ Sharpen, blur and noise reduction, when applied within an image area,
can now use "blend width" to soften the boundaries.
+ Added a modified "top hat" noise reduction method, which is more
effective for some types of noise.
+ Zoom- returns to normal display at once instead of many steps
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