* libgimpwidgets/gimpsizeentry.[ch]: added function
gimp_size_entry_show_unit_menu() for convenience.
* app/tools/gimprectangleoptions.[ch]
* app/tools/gimprectangletool.[ch]: more work on
controls in Tool Options. Can now resize rectangle
by dragging any corner or edge -- move rectangle by
clicking inside and dragging.
* app/tools/gimprectangletool.c
* app/tools/gimprectangletool.h
* app/tools/gimprectangleoptions.c
* app/tools/gimprectangleoptions.h: new code for base
class for rectangle tools.
* app/tools/gimpnewrectselecttool.[ch]: modified to
derive from GimpRectangleTool.
* app/tools/Makefile.am: modified accordingly
* app/tools/gimpselectionoptions.[ch]: remove stuff
no longer needed by new rect select tool.
This is work in progress.