Python lists and dictionaries now convertable

Written for Pytave by qwertitis on 2009-05-05

Now in repository:

* Added functionality for one-row cell arrays. The Python list is
  converted to a one-row cell array and vice versa.

* Added functionality for structs. The Python dictionary is converted
  to a Octave struct and vice versa. The implementation tries to be
  as true as possible to Octave's struct constructor.

* Modified build configuration.