Unit Test registration of python algorithms

[VickieLynch]

This issue was originally TRAC 10341

IntegratePeaksMD2 calls MaskBTP to mask the edges of the detectors. This works from C++, python algorithms, and systemtests. It does not work for the unit tests that call this algorithm. I have put a try/catch so the test will run:

IntegratePeaksMD-[Error] Error in execution of algorithm IntegratePeaksMD
IntegratePeaksMD-[Error] Algorithm not registered MaskBTP

[VickieLynch]

@NickDraper (2014-10-14T09:48:52):
Martyn - Can you discuss this one with the TSC?

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@NickDraper (2014-12-08T10:25:37):
Moved to the backlog at the code freeze of R3.3

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@NickDraper (2015-03-02T11:57:13):
Set to new at the end of Triage

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