Small Fixes

Today I've been going slightly nuts with attempting to valgrind the heck out of bt-daemon.
My findings are that hashmap is actually our main problem in terms of reachable memory.
In my tests, there is around 0.5Mb of reachable memory on quit, however with 375ac06
we see only 0.3Mb of reachable memory on exit.

I've also updated buxton.conf to be preconfigured by autotools, though no doubt we'd ideally want this provided
by packaging.