Shaping up Floha - combinators outline.

Floha is split into interface and implementation modules.

Language.Floha.Base is a set of base definitions, including AST for Floha actors.

Language.Floha.FPrelude is a set of handy actors and combinators, also serves as a first test.
Floha shapes up.

New combinators - rules, -->. New expressions - __.
Floha has named variables and actors. Building internal is also shaping up.