Two major changes:
1. New formula (6) in apply_AK.py
2. Handle profiles defined on pressure boundaries

Working for projection of 4D data and sparse data; added functionality to debug the adjoint for each transform separately

Stratosphere reprojected for satellites; still need to deal with times; vertical interpolation and time_interpolation not re-implemented as default functions

Allowing inheritance of attributes (in particular file and dir) from components to parameters in datavect; fixing formula #3 for satellites

Debug index in obsvect when using several files; dumping properly correlations; fixing satellites for formula #3 and regarding xarrays vs numpy

Fixing surface pressure approximation in CHIMERE; implementing pressure thickness correction factor in satellites; re-ordering time avg transformation to apply it before satellites

Removing builtins calls; fixing CHIMERE with LBC (adj test works); fix satellite adjoint with several periods