Invalid value handling in nTuples

Abhijit Mathadrequested to merge
AM_invalid_value into master

Closes #58 (closed).

The MR makes changes to option files so that invalid value for integer functors are passed by the user when there is no entry in the relations table. For floating point number a nan is tupled.

To be tested with: Analysis!902 (merged), Rec!2992 (merged)

FYI: @chasse

Edited by Abhijit Mathad

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