exception documentation

E.g. if a function expecting 4 parameters is called with 3.

Inherited from InvalidParameters:

Method __init__ Undocumented
Instance Variable bad_call Undocumented
Instance Variable name Undocumented

Inherited from FailedFunctionCall (via InvalidParameters):

Method __gt__ Undocumented
Method __le__ Undocumented

Inherited from ReturnValueMixin (via InvalidParameters, FailedFunctionCall):

Method get_return Undocumented
Method set_return Undocumented
Instance Variable return_node Undocumented
Instance Variable return_variable Undocumented