2013-08-04  Andreas J. Guelzow <aguelzow@pyrshep.ca>

	* src/sheet-control-gui-priv.h (_SheetControlGUI): add fields
	* src/sheet-control-gui.c (scg_init): init new fields
	(scg_im_destroy): new
	(scg_finalize): call scg_im_destroy
	(cb_cell_im_timer): new
	(scg_find_pane): new
	(scg_show_im_tooltip): new
	(scg_class_init): init new field
	* src/sheet-control-priv.h: add field
	* src/sheet-control.c: add virtual
	* src/sheet-control.h: add virtual
	* src/sheet-view.c (sheet_view_edit_pos_tool_tips): new
	(sv_update): call sheet_view_edit_pos_tool_tips
	* src/sheet.c (sheet_col_get_distance_pixels): the defaults need to be
	in pixels
	(sheet_row_get_distance_pixels): new
	* src/sheet.h (sheet_row_get_distance_pixels): new