+ Added monitor-enter & monitor-leave.
+ Added throw, try, catch & finally. Includes a (Try data ex) type.
+ Eliminated the Try type and moved to a more general Eff effect type, with a record holding the different active effects.
+ Exception handling is now done through the :try effect entry, containing the exception types.
+ Added a new :io entry, with a corresponding IO type, for side-effects.
Added the 'binding form.
Added loop/recur.
Added a basic implementation of namespace-management.
* Merged system/env & system/ns.
+ Added a prelude that is meant to cover at least java.lang & clojure.core