Re-categorise PythonAlgorithms

[OwenArnold]

This issue was originally TRAC 5645

We have too many python algorithms for them to be categorised purely by the development language they were written in.

I suggest one of the following:

• Completely ignore the fact that the algorithms were written in Python and give them a category that only depends upon what they do.
• Do the above, but also keep them dual categorised as python algorithms too.

@nick : I'm only writing the ticket so that it's recorded as a useful task to be undertaken. Reassign as required.

[OwenArnold]

@NickDraper (2012-08-10T12:43:56):
Moved at the end of release 2.2

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@NickDraper (2012-10-28T11:39:04):
Moved to milestone 2.4

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@NickDraper (2013-04-29T09:49:46):
Moved to r2.6 at the end of r2.5

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@NickDraper (2013-07-26T13:54:59):
Moved to backlog at the code freeze for R2.6

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@NickDraper (2013-10-25T15:16:45):
Move tickets to Backlog that did not get into R3.0

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@NickDraper (2014-02-14T11:04:57):
Bulk move to assigned at the introduction of the triage step

[NickDraper]

Duplicate of #8840