Pre-release of Haskell prototype

This prototype is (currently) much less sophisticated than the C prototype. However, the code is far more elegant and will serve as a more flexible foundation for future development.

It can currently run R code in a simple shell interface. For example:

> sum [1,2,3]
6

This passes the Morloc vector [1,2,3] into the R function sum and returns the result.

This pre-release is an experimental foundation for the Morloc language. The syntax and features will change wildly in the future with no attempt at maintaining backwards compatibility.