Replaced external variable s (the main spectrum structure) with xxspec to make it more descriptive
Added a new spectrum to all of the output spectral files.
The new spectrum which is now the first spectrum printed is the spectrum of the
created photons as they would be observed at 100 pc, before their inteaction with
the wind.  The only photons which are excluded are photons that are destroyed by
hitting hard surfaces, like the disk.
Small documentation changes to spectra.c