Functioning SpiceCells!

mkwrapper.py

- allow appnd_c calls (they work now!)
- removed zz* calls
- handle SpiceCell pointer outputs by making them
  required inputs also
  - added extra_inoutput_name_list
  - added extra_parse_tuple_string
- moved py_to_c_conversions list before output handler loop
- gen_wrapper returns True instead of full string

pyspice.c

- completed get_py_cell and get_spice_cell
- N.B. get_spice_cell use PyMem_Malloc to create structure,
- disabled SPICE_TIME and SPICE_BOOL cells

spice/objects.py

- bumped minimum character length to six because toolkit
  uses last char as terminator