* app/brightness_contrast.c
* app/by_color_select.c
* app/color_balance.c
* app/color_picker.c
* app/curves.c
* app/histogram_tool.c
* app/hue_saturation.c
* app/levels.c
* app/posterize.c
* app/threshold.c
* app/transform_core.c: modified to call the cancel callback
instead of the ok callback when freed. modified to save the
last used drawable so that we might be able to check later
and restart the tool if need be.
* app/disp_callbacks.c
* app/gimage.c: modified tool restart/destruction code
* app/tools.c
* app/tools.h: added tools_initialize, made changes to
be able save the last used drawable in the tool.
--Matt
f75645a26c