Cleared up issues with Singleton behavior, largely confused by the fact this python logger itself is a Singleton that persists between tests

Mocked up session logging implementation using python log service; two tests are failing apparently due to Session singleton-related issues

Test of patch object classification now explicitly excludes single pixels that are labeled differently

Removed PatchStackObjectClassifier, merged this behavior into IlastikObjectClassifierFromSegmentationModel

Raise error if ilastik data not embedded in project file; but it appears that most test classifiers fail this

Changed formatting of object classification path results

See merge request rhodes/model_server!2

record entry returned by object class map export is no longer a dictionary of paths, but rather one path for object map

API test cases now call PUT through an internal method with re-attempts built in; trying to eliminate lost connections during testing but some still happen

 Conflicts:
	update_source.bat

(cherry picked from commit 7b1c2aff)