Add parent "device" to "microbeam"

[DanBerrios]

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[DanBerrios]

Delay work on this until OBI clarifies and reorganizes "device".

[DanBerrios]

We should update the definition of microbeam to say "A particle accelerator that produces a narrow (micron or sub-micron) beam...".

[DanBerrios]

@PaulNSchofield Do you concur with plans above?