added data conversion and testing script

added a new python-based netcdf conversion script.   It is obviously quite hard-wired, due to the not consistent manner the data are distributed, but what can be generic, is written to be such.


What about changing this comment along these lines:

```python
# Goal here is to generate filenames.
# For the version of the data with MD5 sum 845d2ee0953fcd5f8e977d0cfb023f3d,
# the structure of this data has metadata in records 0-5 and the last record (2935) is the overall filename.
```