Deprecation warning for ctypes function #6

Hi!

When using the ndtable class I get a few deprecation warning since a deprecated functions from ctypes is used.

\sdf\ndtable.py:93: DeprecationWarning: "get_as_parameter" is deprecated. Use "as_parameter" instead
scales_[i] = scale.ctypes.get_as_parameter()

\sdf\ndtable.py:94: DeprecationWarning: "get_as_parameter" is deprecated. Use "as_parameter" instead
self._table = create_table(c_int(data.ndim), dims.ctypes.get_as_parameter(), data.ctypes.get_as_parameter(), scales)

\sdf\ndtable.py:168: DeprecationWarning: "get_as_parameter" is deprecated. Use "as_parameter" instead
params[i] = param.ctypes.get_as_parameter()

\sdf\ndtable.py:176: DeprecationWarning: "get_as_parameter" is deprecated. Use "as_parameter" instead
values.ctypes.get_as_parameter())

Best regards!