Performance fix for graphs in the future : https://github.com/manuelluis/jsrrdgraph/commit/12821cc528bc78adef99b7089d234adb28baf1c8
Fixes for invalid variable references and debugging improvements https://github.com/manuelluis/jsrrdgraph/commit/387c6041f1f9f80a17b208514c7a37d0f5eacc94
Set original step when change time interval.  https://github.com/manuelluis/jsrrdgraph/commit/e2b717ecb149ea8e7846da2a766a9e65613eb209
forgot a commit