EventWorkspace: Plus operation: use merge sort when possible

[mantid-builder]

This issue was originally TRAC 5057

Original Reporter: @jzikovsky

This is an idea Pete had:

If adding a sorted EventWorkspace to another sorted EventWorkspace, it would be possible to use a merge sort to preserve the sorting.

[mantid-builder]

@NickDraper (2012-04-30T14:15:52):
Moved at end of release 2.1

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@NickDraper (2012-08-10T12:45:14):
http://www.mantidproject.org/Release_Notes_2_2_Full_List

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@NickDraper (2012-10-28T11:42:53):
Moved to release 2.4

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@NickDraper (2013-04-29T09:50:08):
Moved to r2.6 at the end of r2.5

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@NickDraper (2013-07-26T13:59:10):
Moved to the Backlog after the code freeze for R2.6

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@NickDraper (2014-02-14T11:07:57):
bulk move to assigned at the into of the triage step

[NickDraper]

archived