PROCEDURE: tplot_rename PURPOSE: Simple procedure to perform a rename of tplot variable without copy. Uses the store_data,newname= keyword to implement, but performs some checks to make it more user friendly. Inputs(required): old_name: current name of the variable or index.(string or integer) new_name: name the variable will have after procedure call.(string) $LastChangedBy: pcruce $ $LastChangedDate: 2013-09-06 14:36:07 -0700 (Fri, 06 Sep 2013) $ $LastChangedRevision: 12962 $ $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/general/tplot/tplot_rename.pro $