Changing projection library

Diana version 3.15

* Using PROJ.4 - Cartographic Projections Library

Diana version 3.20

Coordinates changed from grid (0:nx, 0:ny) to proj-coordinates

Grid resolution moved from class Projection to class Field

Transformations to/from lat/lon-values must be done using Projection::convertToGeographic() and Projection::convertFromGeographic()

Some classes still use grid-coordinates to some degree (TrajectoryPlot, FieldEdit)

Todo

Use Field::gridResolutionX/Y, not Projection::getGridResolutionX/Y()

Add gridResolutionX/Y to class Sat

Remove Projection::getGridResolutionX/Y()

Change Field::interpolate(), should use proj coordinates