This commit replaces all header guards in qt/Widgets with #pragma once.

Replace header guards in Parallel with pragma once

Replace header guards in Kernel with pragma once

Replace header guards in Indexing with pragma once

Replace header guards in ICat with pragma once

Replace header guards in ScriptRepository and SINQ with pragma once

Replace header guards in PythonInterface with pragma once

Replace header guards in Examples with pragma once

Remove all header guards in Crystal and replace with pragma once

Remove all header guards in Catalog and replace with pragma once

Replace header guards in Muon with pragma once

Replace header guards in Nexus and NexusGeometry with pragma once

Fix links between error and y cols in table workspaces

This commit replaces all header guards in ScriptRepository and SINQ with #pragma once

Dont try to mask missing ws spectra

This Commit replaces all header guards in PythonInterface with #pragma once

This commit replaces all header guards in Parallel with #pragma once

This commit replaces all header guards in Nexus and NexusGeometry with #pragma once

Fix Muon Analysis increment arrow

Fix crash when double clicking MD workspace

This Commit replaces all header guards in Muon algorithms with #pragma once

This commit replaces all header guards in Kernel with #pragma once

This PR replaces all header guards in Indexing with #pragma once

This commit replaces all header guards in ICat with #pragma once

Replace header guards in API with pragma once

This commit replaces all header guards in Examples with #pragma once

Suppress type conversion warning generated in gcc compiler from the line using
BOOST_PYTHON_FUNCTION_OVERLOADS. Follow approach used in other cases in the Mantid code base

This commit removes header guards from tcc files that was missed in search script

Remove all header guards in Beamline and replace with pragma once

Merge pull request #28228 from mantidproject/28223_changing_normalisation_on_waterfall_plot_with_filled_areas

Fix changing the normalisation on a waterfall plot with filled areas removing the filled areas

Update Muon user documentation

Fix Unhandled Exception when Changing Curves Options on Non-Workspace Plots

Remove all header guards in Algorithms and replace with pragma once

This Commit replaces all header guards in Catalog with #pragma once

This change fixes a problem in Workbench when setting columns to YErr
Previously this only worked if all Y columns had an associated YErr column. If that
wasn't the case then the associations between Y and YErr cols got mixed up
I have saved the link between the YErr and Y column into the C++ table workspace
object via changes to ITableWorkspace and the Column class
I've also modified the model\view\presenter for the table workspace to set and get
the link via the ITableWorkspace interface
The code in marked_columns.py has been modified to remove the _add function because
the logic required for adding x, y and yerr was sufficiently different that trying
to push them through a common _add function was obscuring the code
Finally I've removed the labelindex from the ErrorColumn object in the python code
because it can be worked out on the fly (and I didn't want to have to save this also
into the C++ table workspace in addition to the linked column index)

As part of the test updates I have removed the test
TableWorkspaceDisplayModelTest.test_initialise_marked_columns_yerr_before_y_doesnt_mark_yerr
because we do require the ability to add a yerr column before the corresponding y column
The model gets refreshed whenever the C++ table workspace is updated (eg when the type of a column
is updated) as part of a replace_workspace call. The model __init__ function builds up the column
set left to right and a user may have set up a Y err column which is to the left of the corresponding
Y column.

Signed-off-by: Harriet Brown <harriet.brown@stfc.ac.uk>