Add ahtable load/save

I need to add tests for this (and obviously, extend load/save to the trie object), but I'm not sure how to get the tests going. Consider me a newb at autoconf, etc. Right now, I have a Makefile and a Makefile.am in the test/ directory, but no executables in there. What do I do to create check_ahtable from check_ahtable.c?