Duplicate window doesn't work with graphs

[OwenArnold]

This issue was originally TRAC 2492

-Open MantidPlot
-Load a workspace
-Choose Plot Spectrum from r-click menu and click ok on default
-Plot is shown
-Click on duplicate window icon on top toolbar

Cloned plot is scaled and titled and labelled and has legend set up correctly. Although actual plot data is missing from cloned plot.

[OwenArnold]

@OwenArnold (2011-02-18T10:36:33):
Screen shot of error

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@NickDraper (2011-04-27T07:36:03):
Bulk move of tickets at the end of iteration 28

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@NickDraper (2011-06-27T08:20:27):
"New" tickets moved at the code freeze of iteration 29

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@NickDraper (2011-09-19T09:30:56):
Bulk move of tickets to iteration 31 at the iteration 30 code freeze

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@NickDraper (2012-01-09T09:43:35):
Moved to iteration 33 at iteration 32 code freeze

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@NickDraper (2012-04-30T14:14:31):
Moved at end of release 2.1

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@NickDraper (2012-08-10T12:45:03):
http://www.mantidproject.org/Release_Notes_2_2_Full_List

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@NickDraper (2012-10-28T11:39:18):
Moved to milestone 2.4

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@NickDraper (2013-04-29T09:50:02):
Moved to r2.6 at the end of r2.5

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@NickDraper (2013-07-26T13:55:02):
Moved to backlog at the code freeze for R2.6

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@NickDraper (2014-02-14T11:07:56):
bulk move to assigned at the into of the triage step

[OwenArnold]

http://trac.mantidproject.org/mantid/raw-attachment/ticket/2492/DuplicateGraphError.png

(uploaded by @OwenArnold on 2011-02-18T10:36:33)

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[NickDraper]

We should just remove the menu option

[NickDraper]

Duplicate works for 1d graphs, 2d graphs and is disabled for several other situations, this looks fine now to me.