suzerain: permit many -d, parse stdin


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suzerain: hide Units usage

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suzerain: command cleanup

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@43661 0bd85f0b-c151-43b9-a1e9-27231104551f
suzerain: #2599 #2736 preserve ideal gas declarations

The starting point for derived quantity work will be the 
Favre-averaged residuals (among other things) sitting within
apps/perfect/perfect_mean.cpp.  However, for #2736, I
want the perfect_mean binary off the books.  So, preserve
its history/contents here first.


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