re #15286

This seems to be incompatible with the RHEL6 compiler.

Added non-virtual clone() interface with a virtual private doClone()
method to Workspace and derived classes. Workspaces that had a clone()
method before were adapted to have a common interface everywhere. In
cases where there was no clone() method previously we simply throw an
error for now, until this new functionality is implemented.

Some tests/mocks had to be adapted since there there is a pure virtual
doClone() in all abstract classes.

Do to smart pointer incompatibilities (mainly due to old boost versions)
we had do extract the raw pointer from the unique_ptr returned by clone
and put it into a boost::shared_ptr manually, in some cases. See also
issue 12949.

Workspace is polymorphic, so in general we do not want any public copy
or assignment. In some cases this required moving the user defined copy
constructor out of the public area, in other cases it meant adding it in
the protected section, to avoid auto-generation by the compiler.

Note that we make the copy constructor protected and not private. This
is in view of the upcoming introduction of a clone() method, which will
need to call the copy constructor of the base class.

Refs #11359

Since we have put PeakShape in Geometry, SpecialCoordinateSystem must be moved to the Kernel package out of API.

refs #7284

Refs #7708

This now returns a human-readable string detailing the structure
of the workspace.
Refs #7708

It is pain to have BC shared pointer in Nexus loader. It is also question if it needs access to box controller at all. This is why it is currently accessed through const pointer