Issue #10: beef up  GemServer>>doComplexTransaction: to include an onCoflictBlock ... GemServer>>doComplexTransaction:onConflict: conflict handling is WHY you use doComplexTransaction:. Allow for exceptionSet customization in gemServer:... gemServerTransaction:... calls and of course add onConflict customization to gemServerTransaction:... calls...GemServerTestServer>>startBasicServerOn: now uses both flavors of gemServer api calls: gemServer:... and gemServerTransaction:...