2006-08-14  Michael Natterer  <mitch@gimp.org>

	Fixed rounding and double vs. integer inconsistency when dealing
	with mouse coordinates. Fixes bug #350694.

	* app/tools/gimpiscissorstool.c
	(clicked_on_vertex)
	(clicked_on_curve): added double x and y parameters and use them
	instead of the integer iscissors->x and ->y. Cleaned up the
	functions a bit.

	(gimp_iscissors_tool_button_press)
	(gimp_iscissors_tool_motion): changed accordingly, also rint() the
	passed mouse coords when assigning them to iscissors->x and ->y.

	Unrelated cleanup:

	(iscissors_free_buffers): removed, folded into reset()
	(precalculate_arrays): removed, folded into class_init()