Add warning message when using old Python API

[Martyn Gigg]

We need to start warning people that the old Python API will disappear in 2.7. This should happen on MantidPlot startup and also whenever anyone runs an algorithm through the old mantidsimple methods.

[Martyn Gigg]

Add warning message about removing old API.

You can also suppress the warnings on a per-file basis. Refs #7419

Changeset: 5931f84531807cd2a554ba760cd7a1da347bbe1f

[Martyn Gigg]

Merge branch 'feature/7419_old_python_api_warning' into develop

Refs #7419 Conflicts:

Code/Mantid/scripts/reduction_workflow/instruments/sans/hfir_command_interface.py

Changeset: 7d7760f3148c5ba68384d25a64a007376a9ddeed

[Martyn Gigg]

Branch: feature/7419_old_python_api_warning

Tester: After merging, starting MantidPlot should give a message about the old API being removed in version 2.7. In addition, whenever you run an algorithm through the old mantidsimple functions you will get a message about using a feature that is going to disappear. It will print the line number & src file you are running from a saved file

• Check that running an algorithm out of the box in MantidPlot from Python doesn't produce any warnings. You can use the attached script and comment/uncomment the 'from mantidsimple import *' line

Also then check that the suppressV1Warnings function works correctly. It takes two arguments: filename & True/False for whether warnings are suppressed or not. The default is true so just the filename can be provided. The suppression is persistent across the MantidPlot session and you have to actively not suppress them (i.e. flick value to False) to get the warnings back.

[Andrei Savici]

Works as described

[Stuart Campbell]

This ticket has been transferred to github issue ​8265