- fetching from forces/develop

- introduced Attribute type in mo_mpr_coordinate.f90
- stores attributes (6 types, 0d or 1d)
- all attributes of a coordinate variable in netCDF are now stored in the Coordinate type also
- but as nc%set_coordinate can only handle string attribute values, only strings are written to file...
- type-bound procedures has_attribute and get_attribute are added
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