Trace upwards through call tree for century_year

1. century_year is dummy arg 2 of split_date_char (share/module_date_time.f); corresponding actual arg is ny, arg number 1 in call 1 by split_date_char (share/module_date_time.f).
ny is not an argument to geth_julgmt. May be local or use-associated. geth_julgmt has 3 arguments 1. julyr of type integer intent out 2. julday of type integer intent out 3. gmt of type real intent out