array parameter 2d plot axis choice

Nobody has claimed this yet.

### Steps to reproduce
1. Take data for a 2d plot with an array type parameter (aka 'multidimensional' or 'hard', for me this is the trace data from a VNA - see [#243](https://github.com/qdev-dk/Qcodes/issues/243))
eg sweep time and take trace every second
2. plot it using MatPlot or QtPlot specifying x y and z variables
ie
`qc.MatPlot(data.VNA_time, data.VNA_frequency, data.VNA_magnitude)`
instead of just
`qc.MatPlot(data.VNA_magnitude)`
### Expected behaviour

Would expect the plot to have x axis time, y axis frequency and colour plot magnitude
### Actual behaviour

In MatPlot it gives an error:

In QtPlot It writes the correct names on the axes but doesnt transpose the plot and makes up values for the axes to correspond to the shape
ie `qc.MatPlot(data.VNA_magnitude)` gives

and `qc.MatPlot(data.VNA_time, data.VNA_frequency, data.VNA_magnitude)` gives

Same system works fine for 1d plot axis switching in tutorial notebook
### System

T5 (windows)
driver/rohde_schwarz_ZNB20

Start by reproducing the multidimensional trace case with MatPlot and QtPlot, comparing qc.MatPlot(data.VNA_magnitude) with the explicit x, y, and z call described here. Trace how MatPlot and QtPlot choose axes and orient 2D array data; done means the explicit call uses time and frequency as axes and magnitude as the color values without errors or fabricated axes.

Written by the indexing model from the issue text.