moved to __init__.py so Sphinx can find docstrings.
finished cleanup of docstrings so sphinx-generated API docs look nice.
more docstring cleanups. don't use PyNIO in NetCDFFile.
docstring cleanups, typo fixes.
cleanups of transform_vector, rotate_vector. more docstrings restifyied.
fixed up docstring for readshapefile method.
fixed URL in drawlsmask docstring.
more work on docstrings.
updating docstrings
further restifying of docstrings
