* 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.