13.2.9} musrbr.f lusrbl.f fusrbv.f user-defined quantities for special binnings

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 These three functions are used to define 3-dimensional fluence distributions to
 be calculated by special user-defined binnings (see USRBIN with 
WHAT(1)
 = 8.0
 or 18.0 in the first card).

 * MUSRBR defines a discrete (integer) variable (by default: region number).
     Argument list (all variables are input only):
          IJ       : particle type
          PCONTR   : particle momentum
          XA,YA,ZA : particle position
          MREG     : current region
          LATCLL   : current lattice cell
          ICALL    : internal code calling flag (not for general use)

 If name-based input is being used, the name corresponding to MREG can be
 obtained via a call to routine GEOR2N:
           CALL GEOR2N (NUMREG, NAMREG, IERR)
 where NUMREG (input variable) is the region number, and NAMREG (returned
 variable) is the corresponding region name (to be declared as CHARACTER*8).
 IERR is a returned error code: if = 0, the conversion is successful. See
 example in the description of BXDRAW below.

 * LUSRBL defines another discrete (integer) variable (by default:
   lattice number)
     Argument list: same as for MUSRBR above

 * FUSRBV defines a continuous (double precision) variable (no default)
     Argument list: same as for MUSRBR above (except LATCLL)

 The 3 functions are called at tracklength events. What is scored is the
 particle track-length multiplied by the particle's weight, possibly
 modified by a user-written FLUSCW (see above).

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