Add fixes to visibility and runway visual range in weather module #26
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visibility can have mixed fractions (1 3/4) that have spaces in them. This fix checks for mixed fractions.
runway visual range format can be specified differently too. I added a check for that format. I based my changes on the following reference: http://www.astro.keele.ac.uk/oldusers/rno/Aviation/metar_codes.html