[PATCH] Add support for more GPS coordinate formats.

[Patrick Valsecchi]

Hi,

As requested in the user forum and in the mailing list, now support:
  - 46.473881 6.784696  (format used in XML files)
  - 48 51.491n 2 17.677e

I was not able to handle the XML format in a generic way without making
the code too ugly. So I've added an exception.

This patch is tested against the v4.4-branch. The cmake build is too 
broken for the moment in master (tests are not built with qmake). It 
applies OK on master with "git am --3way".

CU
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