Implement tagged particle-wall interactions

Registered by Dion Weatherley

Some simulation setups could benefit from having an interaction group in which walls only interact with particles of a given tag. Two examples of such setups are described in:
https://answers.launchpad.net/esys-particle/+question/100432
and
https://answers.launchpad.net/esys-particle/+question/98583
This should be relatively easy to implement and there are multiple ways to do it. The best solution needs to be discussed prior to implementation.

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Needs approval
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