check memory use in coverage before allocating for a specified scale
#666
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Its possible to crash julia currently when calling
coverageby using a largescalevalue (like 10000 or just 1000 if your array is big enough).This PR checks system memory before we allocate buffers and throws some helpful errors and warnings.
If the problem comes from threaded, we switch to single threaded so save buffer memory, but warn when we do that.
Closes #661