Extended version of ERT observation file is not handled

### Extension of ERT observation file for SUMMARY observation fails to be read by` fmuobs`
ERT observation file is extended to be able to specify observations with position and range of influence.
New observation keyword for RFT data is also defined for in ERT observation file.
This extension fails to be read by` fmuobs`.

Error message:

## Solution
Extend the fmuobs code to hande the extension of the ERT observation file or at least ignore the additional LOCALIZATION keyword. The same canbe said for RFT_OBS keyword that is new in ERT observation files.
See ERT documentation for the extended SUMMAY observation keyword and the new RFT_OBS

Example of SUMMARY_OBSERVATION keyword with the extension:

Example of RFT_OBS keyword. Note, check the ERT documentation since also a format with csv file for RFT data is available.