This program creates a string for the history array when multiple datatypes, spacecraft or stations are chosen, for use in the spedas_w_event routine $LastChangedBy: jimm $ $LastChangedDate: 2014-02-11 10:54:32 -0800 (Tue, 11 Feb 2014) $ $LastChangedRevision: 14326 $ $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/spedas/gui/utilities/spd_ui_multichoice_history.pro $