Incorrect time axis units for iris.quickplot.plot #615
Description
When making a 1D plot where time is a coordinate with iris.quickplot.plot the label for the time coordinate is "Time / units", where units is a udunits time unit e.g. days since 1900-01-01 00:00:0.0. However, since the time coordinate will have been translated into date/time for the plot the units part no longer makes sense, and should not be displayed.
An example:
