Don't format table unless DEBUG mode
Don't format table unless DEBUG mode

Formatting this table can be very expensive for large numbers of reflections.
Therefore, unless DEBUG output has been requested, don't waste time formatting
something that will never be printed. This can shave ~50% of the runtime off
dials.symmetry in some cases.

For #1000.

dials/dials,dials/dials,dials/dials,dials/dials,dials/dials