Simplify cond clauses
Fix typo
Add :run time
Fix problems with application of vars

- Support uncurrying of functions
- Support symbols as functions, including uncurrying and partial
  application
Introduce Klam::Cons

The array form was faster to construct, but having a proper class
that allows a fast, inlinable implementation of cons? is better
for overall performance.
Inline =
Inline set and value
Optimize __arity
Optimize partial application

... of vars that are bound to symbols
Introduce Klam::Absvector

To improve performance of absvector?
Inline more primitives
Use Arrays directly for absvectors