Factoring the Gaussian - Part 3

[NoraLoose]

This PR makes a few minor tweaks to code and documentation related to factoring the Gaussian.

• In the Filter Class, distinguish between self.filter_scale and self.filter_scale_iterated. As a result, the string representation of the filter can give back the original filter scale (self.filter_scale) that the user put in, rather than the smaller filter scale associated with the constituent filters. I think this makes it more intuitive.
• I added a few code snippets to factored_gaussian.rst to exemplify the factoring.
• I added a few clarifying sentences and comments to the numerical instability example notebook.

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[iangrooms]

OK, looks good to me. Thanks @NoraLoose!

[NoraLoose]

Thanks Ian!