Warn if not running on a sweetspot

Issue #178 new
David Dickinson created an issue

We might want to print a small warning to screen if running with nproc not a sweetspot (for each of the active layouts?). Going further we might want to extend the calculation of data transferred currently reported for some of the nonlinear redistributes (reported by ingen) to every active redistribute so users can make a more informed choice of processor count.

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