Added os.__exit at end of CellProfiler

to keep Linux from mystery-seg…faulting. Tighter control over JVM
monitor thread including join at end.

From CellProfiler/CellProfiler@d40f1f97a763946944195826685c5892a94a8b7e
Merge 53059cec from CellProfiler plus more

Merge CellProfiler/CellProfiler@53059cec9053a8429b7f0a8f06e6cbe1672b60e7
and merge call and make_call from
CellProfiler/CellProfiler@7f5ad9a78f3dc826f6922b85b69151ef30a6246f.
Merge 7022b543 and 2b4546ba from CP

Merge CellProfiler/CellProfiler@7022b543ed9a589eca2bc4283c75f3cf097e7a3e
and CellProfiler/CellProfiler@2b4546ba7a77ece412329043194bdd3485848370