Update build system for current standards

Update build system for current standards

Update the Autoconf requirement to 2.64 and the Automake requirement to
1.11.  Enable optional silent rules and news file checking.  Add my
normal warnings target.  Use the m4 directory for Autoconf macros and
move supporting programs from tools to build-aux.  Remove the increase
of warnings with gcc in favor of my normal make warnings approach.