2.7.1 --> 2.7.2
---------------

Bug fixes:

- Scientific_netcdf would not compile with NumPy under Python 2.4
  because NumPy also defined Py_ssize_t.

2.7 --> 2.7.1
-------------

Improvements:

- NumPy compatibility. Scientific_netcdf was revised by hand.
  The Python code was run through numpy.oldnumeric.alter_code1 to
  identify the critical sections, which were then all handled in
  some way. It is possible that there are still incompatibilities
  of the kind that numpy.oldnumeric.alter_code1 cannot detect