non-recursive Automake

@cfergeau said this is possible and provided a helping link, so we do that:
http://www.flameeyes.eu/autotools-mythbuster/automake/nonrecursive.html

Additional information in:
http://www.gnu.org/software/automake/manual/html_node/Alternative.html#Alternative
http://www.gnu.org/software/automake/manual/html_node/Uniform.html#Uniform

The first commit (remove Makefiles in the include dir) is already worth it :-)