* themes/Default/images/tools/stock-tool-align-16.png
	* themes/Default/images/tools/stock-tool-align-22.png
	* libgimpwidgets/gimpstock.c
	* libgimpwidgets/gimpstock.h
	* themes/Default/images/Makefile.am: add new (ugly) icon
	for alignment tool.

	* app/tools/gimpaligntool.c: use the new icon; change
	"pressed" to "clicked" for buttons.