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.

type t

val create : string -> t
val out : t -> string
val frob : t -> string -> t
val print : transaction unit

val foo : transaction unit
val bar : string -> transaction unit

val transactional : transaction unit