ENH: fileOperation: fix fileOperation::nProcs to handle multiple candidates

assigned to @andy

added 13 commits

• f0ca8077...577f5844 - 10 commits from branch develop
• d0bf2768 - ENH: argList: use fileHandler.
• eb806a73 - STYLE: spelling
• 11ddfeff - TUT: added fileHandler argument for testing

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approved this merge request

mentioned in commit dbacd7bc

merged