FUNCTION: timerange PURPOSE: To get timespan from tplot_com or by using timespan, if tplot time range not set. INPUT: tr (optional) KEYWORDS: CURSOR set to 1 to use the cursor to set the timerange CURRENT Set to 1 to get the current time range as set by tlimit. RETURNS: two element time range vector. (double) SEE ALSO: "timespan" REPLACES: "get_timespan" CREATED BY: Davin Larson $LastChangedBy: davin-mac $ $LastChangedDate: 2014-02-02 16:56:39 -0800 (Sun, 02 Feb 2014) $ $LastChangedRevision: 14127 $ $URL: svn+ssh:$