Console: oplet size way too small

Oplet "circle" scaling needs to be clamped to a mimimum that's at least as large as the unscaled grey rectangles for the injected CounterOp/StreamScope oplets.

This becomes apparent in a job list the SensorAnalyticsApplication sample where there are widely disparate tuple flow rates - e.g., source flow rates of 1k/sec ~immediately aggregated down to 1/sec.

In the scaled layouts, the size of most oplets makes them just about invisible. They're much smaller than the unscaled CounterOp/StreamScope injected ops (they grey rectangles).