CP013: Make affinity properties hints

[AerialMantis]

Summary

• Updates the wording for bulk_execution_affinity properties to make them hints rather than guarantees.
• Minor editorial fixes to the wording.

Todo

• This pull request removes wording that describes guarantees about consistency between invocations of bulk_execute, a further property needs to be introduced to reintroduce this functionality.

[trws]

I'm sorry that I didn't get to this in a reasonable amount of time to discuss it before the mailing, but one thing that came out of the Cologne discussion was the recommendation that this be worded in terms of assigning work to execution agents rather than agents to resources. It cuts the amount of new terminology the paper requires, and given a way to have the executor bind the agents (or at least a sensible executor) takes care of the distribution as well, while still giving some freedom to things that don't work that way. That discussion also recommended a new paper to discuss iteration-binning for the algorithms, as you kinda need both for either to be all that effective. Clearly not for this mailing, but should I put up some issues for these items?