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   Sizes an Environmental Control and Life Support subsystem (ECLSS).
   Has a demo comparing the three types.
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   Form:
   p = ECLSSSizing( nCrew, nDays, type )
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   ------
   Inputs
   ------
   nCrew            (1,:) Number of crew
   nDays            (1,:) Number of days
   type             (1,:) 'open', 'closed', 'partially closed'

   -------
   Outputs
   -------
   none                  

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	 Reference: Miller, S., "Environmental Control and Life Support System",
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