Cleans up interface (it's now a command line option) and renames project to "sqlcache" in the all-one-word style. Still has issues to do with concurrency, retrying transactions, and foreign function calls that either rely on state or have side effects.

fun f (x : int * float) : string = x
fun g (x : int * float * bool) : string = x
fun h (x : {A : int, B : float, C : bool}) : string = x