Initial work on typecheck.

Implicit casts.
Further work on implicit convertions.
Merge branch 'master' of github.com:scast/bigbrother
fixing example
starting to mix typechecking into table
decorating symbols with type
Half way there on function signatures.
some work to simplify grammar and language
Removing parafernalias mias.
removing pass by name
Type checking for expresion. Seems to be working.
checking instructions
Merge branch 'master' of github.com:scast/bigbrother