add which to find ncdump and an error message if not found #4418
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Use shutils.which to find ncdump, issue an error if it's not in the path.
Test suite: ERR.f19_g17.X.cheyenne_intel
Test baseline:
Test namelist changes:
Test status: bit for bit
Fixes #4173
User interface changes?:
Update gh-pages html (Y/N)?: