Remove add_offset and scale_factor from variable.

See merge request !105

# Conflicts:
#	environment.yml

Develop 76 PHENOMENA and porting to MN5 (78)

See merge request !102

Direct access to variable data

See merge request !101

# Conflicts:
#	nes/nc_projections/default_nes.py
#	requirements.txt

# Conflicts:
#	nes/nc_projections/default_nes.py
#	requirements.txt

# Conflicts:
#	nes/nc_projections/__init__.py

Revert "Merge branch 'release-v1-1-4' into 'master'"

See merge request !99

This reverts merge request !98

- Removed xarray

See merge request !98

Added some chenges that comes from the raster implementation but there are not related with the raster. Those are code improvements as removing xarray dependence.

# Conflicts:
#	nes/nc_projections/default_nes.py
#	requirements.txt

sum_axis: fixed issue where level was a list instead a numpy array

See merge request !97

Develop 74 vertical interpolation extrapolation

See merge request !96