ERT-732: Implemented __contains__ for ecl_sum
ERT-732: Will raise KeyError in get_interp
ERT-731 Fix unicode bug in save config file
Merge pull request #593 from iLoop2/ERT-731

ERT-731 Writing config file in GUI erases content
Merge pull request #592 from joakim-hove/ERT-732-KeyError

Ert 732 key error