Xcode 7 fixes

ConvFit Added Diff data to Mini plot 

Adding tools subtree to pylint

Engg: improved 'plot focused data'

As far as the validation goes this PR fixes the problems. However, When plotting I found that once you have removed background in the range 65000-75000 for example, if you try to adjust the range (65000-65001 for example) then the plot is not updated and the background associated with the previous range will be plotted instead. I would say make a separate issue for this as it is beyond the scope of this one.

Refs #13976

plotMD: add menu option to change normalization

TOFTOF Crop workspace algorithm.

Coverity batch 2

Fixed now

re #13938

Improve saveplot1dasjson

Merge pull request #13939 from mantidproject/13918_squash_remaining_coverity_issues_several_categories

Squash remaining coverity issues in several categories - batch 1

Refs #13897

Refs #13897

re #13938

Refs #13897

Works well after following test procedure, happy to merge.

The dialog has the correct size now and expands on resize.

Works as described. Only workspaces that are not WorkspaceGroup show up in the list.

re #13938