WIP: updating the netcdf interface.
Do not apply scale and offset when reading.
Group channels by unit and area.
Merge branch 'unstable' into feature-netcdf-upgrade
WIP: NetCDF cleaning.

- scale_factor and add_offset are now single values.
- vertical_perspective to geos
Netcdf: working towards better matching CF conventions.
Renamed some global attributes.
Feature: wrapping up new netcdf format, cf-satellite 0.2
Work on new netcdf format nearing completion.
Merge branch 'unstable' into feature-netcdf-upgrade

Conflicts:
	mpop/satin/mipp_xsar.py
Merge branch 'unstable' into feature-netcdf-upgrade
Merge branch 'pre-master' into unstable
Merge branch 'pre-master' into unstable
Bugfix: swath scene projection takes forever from the second time.

The swath scene, when projected more than once would recompute the nearest neighbours for every channel.
More relevant messages in msg_hdf reading.

Signed-off-by: Martin Raspaud <martin.raspaud@smhi.se>
Raised version number
Cleanup: More descriptive message when plugin can't be loaded.

Signed-off-by: Martin Raspaud <martin.raspaud@smhi.se>
Cleanup: clarified import error.
Fixed error message.
Added Europe Mesan area to template