Added a file to export and copy result files if specified to realization-0 for use with covizualization in RMS

[oddvarlia]

Small fixes related to alternative directories for results and include a copy of the ERTBOX.roff file

[oddvarlia]

This branch is identical to the one in PR 739 except that additional option for where to put the result is added and also that ERTBOX.roff grid is added to the result directory. The fix was done to make it easier to use RMS covizualization to visualize the results.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 8.82353% with 31 lines in your changes missing coverage. Please review.

Project coverage is 85.03%. Comparing base (9e052e7) to head (c29a4a5).

Files with missing lines	Patch %	Lines
src/subscript/field_statistics/field_statistics.py	8.82%	31 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #744      +/-   ##
==========================================
- Coverage   85.40%   85.03%   -0.38%     
==========================================
  Files          52       52              
  Lines        7195     7229      +34     
==========================================
+ Hits         6145     6147       +2     
- Misses       1050     1082      +32     

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[mferrera]

OK, you'll have to rebase into this one