#323 TaurusTrend2D: config properties missing

[Carlos Pascual]

(from an internal request at ALBA)

It would be nice if TaurusTrend2DDialog widget would store config info on, at least, the following settings:

The following settings should be handled as taurusconfigproperties so that they can be recovered when reopening a GUI
autoscale setting for all axes ( x,y and z)
scale min and max for all axes
interpolation and colormap settings (parameters/image menu)
axes settings (title, font, ...)

[Carlos Pascual]

see also [#284]