MAG2FLUX

       Convert from magnitudes to flux (ergs/s/cm^2/A).

       Use FLUX2MAG() for the opposite direction.

       flux = mag2flux( mag, [ zero_pt, ABwave = ] )

       mag - scalar or vector of magnitudes

       zero_pt - scalar giving the zero point level of the magnitude.
               If not supplied then zero_pt = 21.1 (Code et al. 1976)
               Ignored if the ABwave keyword is set.

     ABwave - wavelength scalar or vector in Angstroms.   If supplied, then
              the input vector, mag, is assumed to contain Oke AB magnitudes
              (Oke & Gunn 1983, ApJ, 266, 713)

       flux - scalar or vector flux vector, in erg cm-2 s-1 A-1
              If the ABwave keyword is set, then the flux is given by
              f = 10^(-0.4*(mag +2.406 + 4*alog10(ABwave)))
              Otherwise the flux is given by
              f =  10^(-0.4*(mag + zero_pt))

       Suppose one is given vectors of wavelengths and AB magnitudes, w (in
       Angstroms) and mag.   Plot the spectrum in erg cm-2 s-1 A-1
       IDL> plot, w, mag2flux(mag,ABwave = w)

       Written    J. Hill        STX Co.       1988
       Converted to IDL V5.0   W. Landsman   September 1997
       Added ABwave keyword,   W. Landsman   September 1998

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