bug fix, and some additions

Reviewed bug allowing database to be queried on non-existing columns.
Looks like a freak bug and code to prevent it was already in place. Not
sure what happened to trigger the bug on the production server. Wait for
another occurence, then solve.
Added Flex Chart as a button on the left panel. Added Workflow
configuration to the User Settings page

rowers/utils.py

@@ -35,6 +35,7 @@ workflowleftpanel = (
     ('panel_advancededit.html','Advanced Workout Edit Button'),
     ('panel_editintervals.html','Edit Intervals Button'),
     ('panel_stats.html','Workout Statistics Button'),
+    ('panel_flexchart.html','Flex Chart'),
     ('panel_staticchart.html','Create Static Charts Buttons'),
     ('panel_geekyheader.html','Geeky Header'),
     ('panel_editwind.html','Edit Wind Data'),