Because of compatibility reasons for wrongly fomatted data, omega scans
from D16 need to be loaded as histogram instead of point data. This
requires in turn some adjustements to existing algorithm using this kind
of data.

When loading metadata, check if a property is already present before
trying to add it, so that the loading can carry on with a simple warning
instead of failing altogether.

Add ability to rotate Ellipse and Rectangle shapes in Instrument Viewer Widget

Fix formatting of milestone link

--keep-going isn't available until sphinx 2.0
-W turns warnings into errors which should help jenkins figure out that
the build finished with warnings

Sphinx dev docs fixes

Modernise namespaces to use nested specifier

Merged as #32500 has been approved and merged.

Remove assertion difc greater than zero in unit conversion

Update IndirectImport f2py checks

Move interfaces out of scripts folder

Bumps cppcheck warning count up by 3. Cppcheck and clang-tidy disagree
on const ref and std::move.

Clang-tidy states that const ref makes the lifetime non-obvious, and
someone who want's to transfer ownership can use std::move

Cppcheck states that we should take a const ref because copy is
expensive (but doesn't not factor in std::move)

On balance, I'll favour clang-tidy because move is a thing and it
clarifies lifetime especially with shared_ptr. Since these warnings are
in a mess of 1700+ I can't see where the suppression goes, so lets leave
it for the future

FindCenterOfMass performace

Clang-tidy must have though these were obselete (which they are on every platform
but OSX), so protect them with a macro and add them back

Fixes the namespace definition which had too many closing braces on APPLE devices

This way we officially acknowledge we use it, and prefer to use it
because of the reduction in boilerplate

Modernises the codebase from nested workspaces to modern form. E.g.:

namespace A{
namespace B {}
}

Becomes
namespace A::B{
}

This will allow us to specify in the coding standards to prefer the
simple form instead