Remove references to ArgumentError

[phillits]

I've toyed with the idea of creating a new exception class called ArgumentError to be thrown by the functions that check argument types, but I think this function is adequately fulfilled by the built-in TypeError class. There is currently no ArgumentError class in the code, but there are references to it that need to be replaced with TypeError. There might also be some operations that were intended to be included in the ArgumentError class that need to be accomplished elsewhere.