bumps 1.1 source tree was rearranged

[pkienzle]

The bumps source tree is being reorganized for version 1.1, so some imports have moved to different locations.

This PR supports both the old and the new interfaces.

This only affects the python -m sasmodels.compare -edit MODELNAME invocation used to explore the parameter space of the model interactively.

Test that it works before and after using

uv pip install git+https://github.com/bumps/bumps.git@centralize-bumps-api-4
python -m sasmodels.compare -edit cylinder
uv pip install bumps==1.0.4
python -m sasmodels.compare -edit cylinder

[krzywon]

Looks okay to me. Tested locally using the bumps branch and the latest stable release and both work as expected.

This doesn't need to be merged before the code freeze, but won't hurt anything if it is.