structure for using nc files as intermediate file format

[vergauwenthomas]

No description provided.

[vergauwenthomas]

TODO and tocheck

• Make method to combine multiple 2D variables, of the same field, to a 3D variable
• After reprojecting, dimensions change to lat and lon. This results in errors if reproject is applied again
• test the combination methods for collection
• test on surfex files
• test CLI interface

[kobebryant432]

Attempted to test sfx and CLI but failed (even with a normal file).
See issue #65