- Added more information of failure handling.

Re #22263

Also fix test output

Re #22263

As verified with Martyn

Re #22263

- Added docs for CellStandardItem.
- Re-shuffled code in CellStandardItem.

Re #22263

- Added corresponding documentation.

Re #22263

- Reorgranised JobTreeView page.
- Added documentation + example for filtering.
- Moved RowPredicate into its own header.

Re #22263

Re #22263

Re #22263

- Fixed more python C API incompatability.
- Replaced other instances of std::equal.

Re #22263

- Started documenting StringModelIndexing
- Moved examples into their own files.
- Added documentation for Cells more detail for Subtrees in
  JobTreeView.rst.

Re #22263

Re #22263

Re #22263

Re #22263

# Please enter a commit message to explain why this merge is necessary,
# especially if it merges an updated upstream into a topic branch.
#
# Lines starting with '#' will be ignored, and an empty message aborts
# the commit.

Merge done to enable documentation be be fixed, because of removal of
alias directive and addition of related algorithms directive.

Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>

- Added RowLocation class for storing paths to nodes in the BatchWidget.
- Added description as a concept in new dev-docs page for BatchWidget.

Re #22263

Tidys up a few pages and links along the way.
Refs #22082

Refs #22082

Adds a brief explanation of the master pipeline view to the developer
documentation.