Added option to draw measurement circles around site
Options:
SiteCircles = true;
SiteCirclesDistances = new Array(100,150,200);

Circles are only shown if 'SiteShow' is true. SiteCirclesDistances is array of numbers. Distances are in NM or km depending 'Metric'-settings.

	modified:   public_html/config.js
	modified:   public_html/script.js