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This adds the physical memory region to the kernel memory manager in a second
(emulated) numa node.

Co-authored-by: Hejing Li <hajeongee@gmail.com>

This uses somewhat more specific exception types instead of just Exception()
everywhere. Makes pylint happy.

I basically did the following:
`mkdir experiments/simbricks/orchestration`
`mv experiments/simbricks/* experiments/simbricks/orchestration/`

Additionally, imports and paths had to be adjusted.

fixes isort's wonky detection of first- and third-party for modules located in experiments/pyexps import modules from experiments/simbricks

Experiments can explicitly specify opt/fast (default is the latter).

Also add no checkpoint parameter

This changed a while ago in one of the refactoring steps so some of the scripts
were broken.