MPH_help - display help info

This routine displays some help info for the MPH setup interface and some inquiry functions.

REVISION HISTORY:

       2001-Nov-15 -- add PROTEX convention
       2001-May-20 -- first prototype

INTERFACE:

       subroutine MPH_help (arg)

USES:

       implicit none

INPUT PARAMETERS:

       character(len=*), intent(in) :: arg   ! either 'on' or 'off'

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