Changelog for GIMP unsharp mask plug-in.
--- 0.11 --- 2000/01/27
- Removed redundant variables from unsharp_mask function.
- Fixed memory leak (forgot to free cmatrix and ctable).
- Removed unused whitespace.

--- 0.10 --- 1999/12/13
- Threshold parameter wasn't being saved.  Found and fixed by Peter Daum
  <gator@cs.tu-berlin.de>.
- Removed debugging fprintf at top of dialog_i.c.  Oops.

--- 0.9 --- 1999/08/27
- Changed all // comments to /*...*/.
- Changed dialog_f parameter types.

--- 0.8 --- 1999/07/02
- Made threshold an integer-valued slider, from 0 to 255.
- Changed thresholding method.  Thanks to Carey Bunks <cbunks@bbn.com>.
- Radius parameter changed to refer to the standard deviation instead
  of the radius of effect.  The radius of effect is 2*std_dev.
- Added dialog_i files.

--- 0.7.1 --- 1999/06/29
- Changed Makefile to use gtk-config so that it would compile on all systems.

--- 0.7 --- 1999/06/28
- Fixed bug in which plug-in would crash when radius > either dimension.
   Thanks to Carey Bunks <cbunks@bbn.com> for the bug report.

--- 0.6 --- 1999/06/07
- Switched to gtk_dialog_new() to create dialog
- Titlebar now exists under FVWM.
- OK is now the default action.
- Version number now shows in titlebar.
- Some useless code blocks removed.

--- 0.5 --- 1999/06/02 ---
- Revamped interface portion -- added sliders using GTK adjustments.
- Added threshold parameter.  Any difference above the threshold is reduced
  by the threshold amount, and any difference below the threshold is
  reduced to zero.

--- 0.4 ---
- Fixed "amount" storage bug -- the combine amount was permanantly set to
  0.5 before, no matter what was entered in the dialog box.
- Added a more comments... the code should be almost readable now.
- Optimized gaussian blurring code a little -- overall time decreased by
  approximately 25-30% on my Celeron-450.
- Added a timer function in the code.  It's controlled by an #ifdef, so a
  recompile is necessary to turn it on or off.

--- 0.3 ---
- Added #include lines for basic for stio.h, math.h, and string.h.
Some systems require these lines to compile.

--- 0.2 ---
- First publicly distributed version.