For more complex types such as V3D, the python API for TableWorkspace
used to return a incomprehensible string. Now it returns a proper
string type name.

They appear to change the API in the javascript layer without fully
reflecting it in the documentation. This even affects the older python
API mantid uses.

While helping prepare an article, I ended up deriving the equivalence of
delta-d/d = delta-T/T. Since it wasn't a 5-second derivation, it seemed
a good thing to add to the user docs.

This split out the material information into a new concept page, added
additional links between the various docs, and added a big note at the
top of `SetSample` that the dict definitions are in cm.

Previously the HKL values would only show when when viewing a single
detector. Now when plotting with a collection of detectors the HKL
values will also be plotted in the miniplot.

There are two big changes in this PR. The first is inspecting the what
specific Load algorithm was used and switching to that after the first
chunk is loaded (removes determining the specific loader for subsequent
chunks). The second is to remove the logs before accumulating the
chunks.

Refs #23399

Previously the integration volume would be quietly undefined. This makes
it much more obvious to the user when something goes wrong. The
underlying issue is in the numerics of determining what is inside the
shape.