rename xsidle to xsslaunch and install it

Makefile

@@ -40,7 +40,9 @@ install: all
 	@echo installing executable file to ${DESTDIR}${PREFIX}/bin
 	@mkdir -p ${DESTDIR}${PREFIX}/bin
 	@cp -f xssstate ${DESTDIR}${PREFIX}/bin
+	@cp -f xsslaunch ${DESTDIR}${PREFIX}/bin
 	@chmod 755 ${DESTDIR}${PREFIX}/bin/xssstate
+	@chmod 755 ${DESTDIR}${PREFIX}/bin/xsslaunch
 	@echo installing manual page to ${DESTDIR}${MANPREFIX}/man1
 	@mkdir -p ${DESTDIR}${MANPREFIX}/man1
 	@sed "s/VERSION/${VERSION}/g" < xssstate.1 > ${DESTDIR}${MANPREFIX}/man1/xssstate.1