Added skeleton models for GradingSurveyGroup and Records. SurveyRecordGroup has been renamed to GradingRecord. GradingSurveyGroup will hold which Surveys should be linked. While the acompanying GradingRecords (with their reference to a GradingSurveyGroup) will hold the Records for each StudentProject that can take these Surveys.

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"""

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Code used in a couple of places to work with the current thread's environment.

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Current users include i18n and request prefix handling.

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"""

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try:

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    import threading

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    currentThread = threading.currentThread

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except ImportError:

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    def currentThread():

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        return "no threading"

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