[GSAS-II] Change in scripted TOF pattern simulation

[Toby, Brian H.]

I would like to alert people using GSAS-II scripting to a change in the API that may require changes to scripts. This will only affect people who use scripting to simulate TOF patterns.

When originally written, the G2Project.add_simulated_powder_histogram<https://gsas-ii.readthedocs.io/en/latest/GSASIIscriptable.html#GSASIIscriptable.G2Project.add_simulated_powder_histogram>() was intended to take as input TOF times in milliseconds. Due to a bug it was actually using times in microseconds. It was also computing TOF patterns on linear grid rather than on a log grid and was using the time-step incorrectly. I have corrected all this and updated the function documentation (found here: https://gsas-ii.readthedocs.io/en/latest/GSASIIscriptable.html#GSASIIscriptable.G2Project.add_simulated_powder_histogram).

These changes will require a change in the times supplied to G2Project.add_simulated_powder_histogram<https://gsas-ii.readthedocs.io/en/latest/GSASIIscriptable.html#GSASIIscriptable.G2Project.add_simulated_powder_histogram> in any scripts used to simulate TOF patterns for those scripts to run after an update to version 4469 or later. I am sorry for this.

Brian
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