for version 0.5:
    * handle gamma-compressed images
    * configurable "read threshold"
    * sparse sampling grid (speed/quality tradeoff; 2x2 by default)
    * choice of plane-fitting method
    * "flat averages" method
    * improved least squares estimation
    * bilinear and bi-nth kernels
    * "manhattan" distances etc.
    * hide unused UI elements
    * scripting should work now

for version 0.4:
    * improved UI with a preview
    * support using active brush as kernel
    * "subtract selection" option

for version 0.3:

    * using the least squares method for plane-fitting
    * removed kludges, fixed bugs

for version 0.2:

    * used gimp-plugin-template package, for easy compilation and installation
    * choice of which channel will be used as input mask
    * "new layer" option to save result as a new layer
    * internationalization support
