adding in output selection support when noxaxis command is present, can end up with a 0-D array if one output and noxaxis is used, which is odd..

Only thing missing really is the arxiv link to the document.

wz -> w for gaussian parameters.

an error I would prefer to just print that and exit(1).

which might work better for thermal lens part.

in older revisions of scipy.

added proper formatting to the gauss parameters i.e.
{.15g}, probably need to do that for many other params as well.

code lines that were not parsed into an object but have been
added as extra lines. This works for me, but we could do
something more sophisticated if needed.