increases crith from 5.e-3 to 1.e-2.
adds output to xout_detal3.fits of rrcs during step-by-step output
fixes length of strings kdesc2 in ucalc to avoid compilation warnings
brings back the chisq routine which checks statistical equilibrium
increases the number of spatial zones which can be saved for for printout to 3999
adopts random access io for xout_tmp files.
resurrects the dalgarno and butler charge excchange (data type 21)