Revert caching of ScatteringFactorTable values at Q=0.

Caching of Q=0 value would require cache clearing workarounds
if standardLookup function depended on some external parameters.
Simplify the code, Q=0 caching does not add much value here.

This reverts commit 4b1b76b86a3650cadc742a1df88e6a839d251e80.
Update ticker of the owner instead of owned object.

Assignment of new object to composite classes now updates
ticker of the owner instead of ticker of the owned instance.
The state of the owned instance does not change when assigned
to some owner.
Allow override for registerThisType().
Register SFT also under its radiationType().

Override registerThisType for ScatteringFactorTable so that concrete
instances get registered under both type() and radiationType() names.