* acinclude.m4: Added "maximum" to the arguments that can be used
	in --with-compile-warnings. This was always available, just not
	mentioned. It is the same as "error", just without -Werror. Also
	make "maximum" the default not "error" (only for builds with
	autogen.sh). 

	* configure.ac: Add a status string in the summary with the
	compile warnings setting.

svn path=/trunk/; revision=2878