Expand GroupWorkspaces to allow grouping of table workspaces

[Anders Markvardsen]

1) Modify the algorithm GroupWorkspaces to allow this 2) Do a test. Group say a TableWorkspace and a standard MatrixWorkspace. Try to run this grouped workspace through a number of Mantid algorithms such as Minus and CropWorkspace. Likely outcome is that error messages will be displayed which needs to be dealt with. Initially the way do deal with these will be to modify how algorithms handle groups. E.g. Algorithm.cpp has a method: bool Algorithm::processGroups(). Modify this method to ignore TableWorkspaces and log this.

[Robert Whitley]

I took the code out of GroupWorkspaces.cpp that checks to see if all workspaces are the same.

The code from ticket #3790 ran without a problem and grouped all workspaces together. I then tried to run the newly formed workspace group through a series of algorithms.

The current implementation of Mantid does not allow for the 'mixed' workspace group to be picked up by an algorithm.

[Robert Whitley]

Refs #3790. Fitted workspaces within the muon interface are grouped.

Includes code for #4055. Expand the group workspaces allowing for mixed workspaces with table workspaces. The algorithms work with the newly formed groups but will ignore the table workspaces if they come across one.

​https://github.com/mantidproject/mantid/commit/a42ba792541f578e9099a4e0a8724cc0b1d84caf

[Robert Whitley]

Refs #4055. Add test for grouping TableWorkspaces.

Changeset: a2a92a19b50965a8796f3b76e3ed306f41507e1d

[Robert Whitley]

Refs #4055. Add test for grouping TableWorkspaces.

Changeset: a2a92a19b50965a8796f3b76e3ed306f41507e1d

[Anders Markvardsen]

These with mixture of tableworkspaces and matrixworkspaces

[Stuart Campbell]

This ticket has been transferred to github issue ​4902