Add ability to add features to existing track without retracking#461

freemansw1 wants to merge 35 commits intotobac-project:RC_v1.6.xtobac-project/tobac:RC_v1.6.xfrom

freemansw1:append_features_for_timefreemansw1/tobac:append_features_for_timeCopy head branch name to clipboard