Revision 192

Removed the possibility to read aerosol fields. This was not
operational. It required fields already regridded in the three
dimensions. It seems quite weird to me not to have online vertical
regridding, since the surface pressure varies. There was the
possibility of adding vertical regridding. But development is not in
the spirit of LMDZE. Furthermore, the treatment of aerosols that was
in LMDZE is completely obsolete in LMDZ. We could try importing the
up-to-date treatment of aerosols of LMDZ, but that carries LMDZE quite
far: there is the problem of the calendar and the problem of updated
radiative transfer required for updated aerosols.