avoid argument parsing (via meth_o, meth_noargs) for non-python-object arguments, upgrade version number to 0.9.6.4

compiles and runs SAGE fine

previous patch was just for classes

Emulates behavior of

from <module> import *

For some reason, it actually makes it slower in some of the most common cases (now commented out). Why? It does help in others.

Now if you inherit cdef methods from another class, you may re-declare the
arguments and return variables to be sub-types of the original declared type.
This will be especially convenient for the SAGE arithmetic architecture.
Type-checking is performed if necessary.

One rarely, if ever, wants the [step] argument to be negative.