Add test case for non-adaptive localisation

Add import script for field parameter importing into RMS for QC purpose
Add import script for upscaled field parameter importing into RMS for QC purpose

tests/jobs/localisation/example_case/README

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+Directory for test case for non-adaptive localisation (LOCALISATION_JOB)
+Main components:
+ERT config file: sim_field.ert
+
+The ERT model depends on:
+scripts/sim_fields.py
+
+ERT input:
+GRID keyword: GRID.EGRID  - can be generated by the script sim_fields.py
+time_map.txt
+localisation.wf
+
+
+Other files:
+randomseeds.txt - Not used by ERT, but by sim_fields.py
+                               This file can be generated by sim_fields.py
+UpscaledGrid.EGRID - Not used by ERT, but by sim_fields.py
+                                     This file can be generated by sim_fields.py
+
+
+How to use the script sim_fields.py:
+The main has some (global) variables turning on/off various options:
+make_seed_file:  To create the file randomseeds.txt
+write_file_grid:   To create the grid file GRID.EGRID
+write_coarse_grid:  To create the coarse grid file UpscaleGrid.EGRID
+write_upscaled_to_file:  Write upscaled field values to file for QC purpose. Not mandatory.
+write_obs_pred_diff_field_file:  Write field for the coarse grid containing difference of observed values minus predicted obs values.
+extract_and_write_obs: Extract observations for the selected grid cells and write to ERT observation files. Generate local_config.yml
+
+Typical workflow:
+1. Generate seed file and the grid files by activating the relevant options mentioned above and run scripts/sim_fields.py
+2. Create sub-directory observations and observations/obs_data
+3. Edit the setting dictionaries in sim_fields.py to change the current settings if wanted.
+3. Generate observation files and local_config.yml file by running scripts/sim_fields.py
+4. Turn off the above mentioned options, but set write_upscaled_to_file active (and optionally write_obs_pred_diff_field_file)
+5. Activate/not activate localisation in ERT config file (HOOK_WORKFLOW  LOAD_WORKFLOW for localisation)
+6. Now ready to run ERT.

tests/jobs/localisation/example_case/init_files/README

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+Directory where initial ensemble realisation is saved:
+FieldParam.roff - The field parameter
+Upscaled.roff    - The upscaled field parameter (for QC purpose)
+UpscaledObsField.roff  - The upscaled field parameter used when
+                                         extracting observations (selected grid cells to be used as observables)
+UpscaledConditionedCells.roff - A coarse grid parameter with all cells except the cells defined as observable
+                                                      with a dummy value  and the observable grid cells with the values used as observations.

tests/jobs/localisation/example_case/localisation.wf

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+LOCALISATION_JOB local_config.yml

tests/jobs/localisation/example_case/observations/README

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+Directory where the observation file observations.obs and sub directory obs_data will be saved.