       Note Well: There are similar routines in ../../new_main/subs/chg. At present
           these have different names, but only by _V?. Be careful when altering
           these routines --- make sure you do not create naming conflicts.

5-Dec-2000
       eval_chg_rates.f
           Reaction formula for reaction TYPE_CHG=3 fixed
       steq_ba_chg_exch.f
           Installed reaction formula for TYPE_CHG=3
           Installed TVAL so that formula are only used inside the fitting range. 
       chg_exch_mod.f
           Removed bug in left justifying strings. Could cause infinite loop when bug
           in CHG_EXCH_DATA file.
           Now use / to separate non-unique level names. Only one alternate name is allowed.        
