Add functionality for a curvilinear coordinate

Compared to rectilinear coordinates, this will add an additional
field which corresponds to the correct vertical coordinate.
Visualization in ParaView or VisIt will require adjusting the
data field by this new field.

This closes issue #8 

See merge request !5

Visualization software (VisIt and ParaView) naturally reads the
netcdf file in the order swapped from what SPINS outputs. Having
the converter to the swapping makes the visualization considerably
easier. Swapping the axes as the default is desired and now
implimented

Compared to rectilinear coordinates, this will add an additional
field which corresponds to the correct vertical coordinate.
Visualization in ParaView or VisIt will require adjusting the
data field by this new field.

Ignore unnecessary options in spins.conf

Fixes issue #11

See merge request !4

Fixes issue #11

Fix issue #7 (Output time not understood by Paraview)

Also fix error in dimension ordering for non-swapping case.

Also change spatial and temporal units to use long form.

See merge request !3

The issue remains if only a single netcdf file containing
only a single SPINS output is imported into ParaView.
If there are multiple outputs within the file, or multiple
files are read simultaneously, then ParaView displays the
time correctly.

Also fix error in dimension ordering for non-swapping case.

Also change spatial and temporal units to use long form.

add feature #9 (using memory mapped file as an option) for regular runs that don't need swapping axes

Fix permuting of array dimensions

Previous state assumed a different ordering of the dimensions of
the input array than what it actually had. For swap-axis flag this
led to striding errors. The original array is in (x,z,y) format,
while the final is in (z,y,x).

Fixes #5 

See merge request !2

Previous state assumed a different ordering of the dimensions of
the input array than what it actually had. For swap-axis flag this
led to striding errors. The original array is in (x,z,y) format,
while the final is in (z,y,x).