13.2.31} usrini.f USeR INItialisation

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     Argument list:
          
WHAT(1)
, (2), (3), (4), (5), (6) : user-given numerical parameters
          
SDUM
 : user-given character string (8 characters)

 Subroutine USRINI is called every time a USRICALL card is read in
 input. It can be used to do any kind of initialisation: reading
 and manipulating data from one or more files, calling other private
 routines, etc.
 The calling parameters can carry any kind of useful information or can
 be used as flags to choose between different possible actions to be
 performed before any particle transport takes place.

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