add config file resource for removal of tmp files. fix bug in writing exblx file for revcomp features.

add functions to: merge two styles, merge two lists of styles, return list of predefined styles, destroy a list of styles.

zmapWindowContainerExecute and
zmapWindowContainerExecuteFull

This code keeps better track of the size of the containers rather than
asking the foo_canvas via foo_canvas_item_get_bounds.