Added CodeFragment::removeChild(CodeFragment)

Utility function for removing without iterators. Useful when iterators
have become invalidated.
Renamed "Name" to "Symbol" in pattern and token
Moved vector ops example code to vectoring.txt
Added modifier.txt example

Also deleted testcode.txt as it shouldn't appear in source code.
Forgot new CodeFragment header for d11a981
Implemented modifiers and function calls

Function calls without the excessive <- operator.

The ModifierParser can probably be written statically instead of using
the current constructor.
No need to be so generalized.