ERT-791: Write welldata to restart files
ERT-791: Added method ecl_rsthead_alloc_empty() - to be used by opm-core code
ERT-791: Changed name of well_type_enum value PRODUCER -> WELL_PRODUCER to avoid name clash with opm code
ERT-791: Fixed name error: Method well_info_iget_state_from_report was declared but not declared, method well_info_iget_state was defined but not declared. Using name well_info_iget_state
ERT-791: Prepended enum values in well_type_enum with ERT_ to avoid name clash with OPM code
ERT-791: Prepended enum values in well_type_enum with ERT_ to avoid name clash with OPM code
Merge pull request #655 from chflo/ERT_791_write_restart_file_wellinfo

Ert 791 write restart file wellinfo