merge include Makefiles to main Makefile
Move test/ and examples/ Makefiles to root Makefile
autotools: enable subdir-objects
autotools: merge src/Makefile.am to Makefile.am

There is only one Makefile.am now and all binaries are generated in the
root (build) directory.
Well, at least the libtool wrappers are. The binaries are in .libs/
autotools: only state the version once

The key seems to be to use defines for that part,
rather than shell variables.
Merge branch 'non_recursive'

see pull-request #16