convert to automake

[vapier]

the Makefile.in files contain a lot of hand written logic to deal with dependency info and dist targets (among other things). it would be nicer to convert it all to automake (and Makefile.am files) to get all this for free. it would also fix out-of-tree builds which currently don't work (e.g. run mkdir build && cd build && ../configure && make and watch it fail).

any concerns before embarking on this cleanup ?