*   First non-alpha release.
*   More or less complete redesign of library.  The entire API is completely
    changed, and there is no backwards compatibility!
    *   Everything is now "implicit" style, and there is no more `BP` monad.
    *   Accessing items in `BVar`s is now lens-, prism-, and traversal- based,
        instead of iso- and generics-based.
    *   `Op` is no longer monadic
    *   *Mono* modules are removed.
    *   *Implicit* modules are removed, since they are the default
    *   *Iso* module is removed, since `Iso`s no longer play major role in the
        implementation of the library.
*   Removed dependency on *ad* and *ad*-based ops, which had been pulling in
    the vast majority of dependencies.
*   Moved from *.cabal* file to *hpack* system.