============
utils.py
============

This file has three functions in it so far:

- writeExDataFile(filename, coords, mean_radius_field=None)
	Write out an ex data file with the given coords.
    :param filename: Filename to write to.
    :param coords: List of coordinate lists.
    :param mean_radius_field: Additonal mean radius field to write out (optional).
    :return: None
- writeExNodeFile(filename, coords)
	Write out an ex Node file with the given coords.
    :param filename: Filename to write to.
    :param coords: List of coordinate lists.
    :return: None
- writeipNodeFile(filename, coords)
	Write out an ipnode file with the given coords.
    :param filename: Filename to write to.
    :param coords: List of coordinate lists.
    :return: None