(maint) Remove commented code that moved elsewhere.
(main) Fix typo in comment.
(maint) Fix "." "," typo in tree dumper
(maint) Add dump for UnaryMinusExpression
Handle numbers when lexing, parsing, and in model with radix.

This adds proper handling of numbers:
- an lex error if a number is not formatted correctly
- parser creates QualifiedName or LiteralNumber for NAME token
- tree dumper outputs numbers with specified radix