[PATCH] Make ISO-6709 coordinate regex less restrictive

[José Carlos Andreu Galán]

I found myself trying to copy/paste coordinates for my dives from diving
websites / forums and Subsurface did not accept them because it was
applying strictly the suggestions from ISO6709 Annex D.
Now it parses them correctly with messy whitespace and use of '' (double
simple quotes) instead of " (single char of double quotes) for the seconds
symbol which I found to be a very common mistake at this kind of sites.

Regards,
Jose
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