haloToCell improvements
As noted in !463 (merged), the haloToCell is currently too rigid. It enforces grow/shrink step of at least 1, can also show some issues with parallel-synchronization.
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added enhancement label
As discussed in !463 (merged) and off-line, it doesn't make sense to enforce a min grow/shrink step of 1 since this precludes it being used as a pass-through filter (ie, the user specifies 0, but it does something anyhow).
The optimized early break from the growth loop should be parallel aware. So probably better just to skip it entirely.
Add setter/getter methods for the steps, to allow better reuse.
mentioned in commit 02881f62
mentioned in commit 269d0ffd