Certain instrument view python commands don't work

[martyngigg]

While testing the commands at http://www.mantidproject.org/MantidPlot:_Viewing_the_Instrument_from_Python it became apparent that the setBinRange and selectComponent methods no longer worked.

The idea of these methods was that the values could be set before any rendering/integration had happened and when the window was shown it would be set to the values given in the scripts.

I.e. Setting the bin range should mean only calculating the integration once rather than calculaing the whole range on start up and then again when set.

[martyngigg]

This issue was originally trac ticket 3784