Merge branch 'ArmarXPlotterFix' into 'master'

Fixed CSV export in ArmarXPlotter class

When trying to export simulation data of ControlX with the csv export feature the plotter class produced a malformed csv with only one column containing a concatenation of the data values + iso formated time string.  I introduced a fix that writes the columns in the correct order, includes separators and spares out the time string.

See merge request !7