[ATM] Update for Mirror Edge Support Calculator

["Robert Houdart" <robert.houdart@cruxis.be>]

An update of the Mirror Edge Support Calculator sheet is available at
the same address as previously:
	www.cruxis.com/scope/mirroredgecalculator.htm

The explanatory text has been expanded in response to the many questions
and comments I've had, and there are some new features:

- New cases allow you to evaluate yourself how accurately you should
position the edge support with respect to the center of gravity of the
mirror.

- A comparison table with a number of less than ideal edge support
configurations for a 24" f/3.3 mirror demonstrates why the recommended
configurations are best.

- The reduction of the mirror's Strehl Ratio at the horizon and at 45°
altitude is shown to give you an idea about the impact of the edge
support on the mirror quality.

As always I'm looking forward to any feedback about this issue.

Cheers,
Robert Houdart

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