Introduced a mapping for constants.
Merge branch 'master' of https://github.com/cwi-swat/rascal.git
Major rewrite:
- All OO-style removed from the kernel of the interpreter; we are just
interpreting an array of ints now.
- Improved the fluent interface of Instructions.
- Improved the API of RVM.
- Restructured the code for maintainability.
- WORK IN PROGRESS!