The default ilwr model in Atmosphere as been changed to Unsworth. The fixed snow albedo has been set to 0.85 for all filters/generators using it. 

The Config class can now import an ini file from another ini file, this could greatly simplify the management of operational deployments (a station that has a special configuration now can simply import a standard config file and redefine what it needs). This is either done with IMPORT_BEFORE or IMPORT_AFTER in order to choose who has precedence. Multiple (ie recursive) inclusions are supported with some enforced limitations to prevent circular dependencies.