wsvreader.py: Update documentation at top

[Walter Doekes]

Replace this:

# vim: set ts=8 sw=4 sts=4 et ai tw=79:
# WJD/2013
# WSV = Whitespace Separated Values
# TODO: add docs here
# TODO: replace "extra0" column name with "_columnN" where N is the Nth
# column. that makes more sense.

With proper copyright and help. Remove/fix the TODOs.

[Walter Doekes]

Wrong project.