Keep original type specifiers around #30
Description
The unparse methods have gotten very unwieldy in a probably vain attempt to print ctypes nicely. We could just keep the original type specifiers around when ctypes are constructed from specifiers, and print those. It would be a little memory overhead but shouldn't be a big deal. We'll need to keep the unparse methods for when ctypes are constructed by other more synthetic means (e.g. disjoin or just make-instance-ing the classes directly).