ERT-791: Changed name of enum value PRODUCER int well_type_enum to WELL_PRODUCER to avoid name clash with OPM code
ERT-791: Fixed error in method name: well_info_iget_state_from_report() was not implemented, well_info_iget_state() was
ERT-791: Using ecl_rsthead_type instead of intehead_data struct, deleting intehead_data
ERT-791: Added method ecl_rsthead_alloc_empty()