Support for getting maximum extent in lon/lat. Useable with MSG(3), and shouldn't break polar satellite production.
Removed obsolete publisher/logger
Syntactic cleanup
Syntactical cleanup
Moved common functions to own file
Moved older version of trollduction to own file. Also, implemented area extent for any area definition (regardless of projection) for MSG, and data reduction for polar satellites.
Adjusted to use old_trollduction.OldTrollduction.
Moved OldTrollduction to own file old_trollduction.py.
Added <disable_data_reduce>
Added get_maximum_ll_borders()
GEO extent calculations moved to mpop, data reduction (for swath data) moved to mpop
Removed handling of disable_data_reduce config keyword
Removed disable_data_reduce config keyword
Converted to use area extent calculations based on the area definition borders instead of lonlat corner points
Merge remote-tracking branch 'origin/feature_xrit_extent' into develop

Conflicts:
	trollduction/custom_handler.py
	trollduction/trollduction.py

Conflicts resolved.