Performance. Analysis structure and relationship with Analysis Service refactored

[rockfruit]

The relationship between AnalysisService and the various types of
Analysis has been refactored. The class heirarchy now looks like this:

- AbstractBaseAnalysis(BaseObject)
    Fields and methods common to to AnalysisService and all types of analysis
- AbstractAnalysis(AbstractBaseAnalysis)
    Fields and methods common to all types of Analysis.
- AbstractRoutineAnalysis(AbstractBaseAnalysis)
    Fields and methods common to Routine Analyses (Analysis, Duplicate).
- AnalysisService(AbstractBaseAnalysis)
- ReferenceAnalysis(AbstractAnalysis)
- DuplicateAnalysis(AbstractRoutineAnalysis)
- Analysis(AbstractRoutineAnalysis)

    In the final schema for Analysis objects, the following fields are removed to be replaced by accessor methods on the class:
        - Service
        - ClientUID
        - ClientTitle
        - SampleTypeUID
        - SamplePointUID
        - CategoryUID
        - MethodUID
        - InstrumentUID
        - DateReceived
        - DateSampled
        - InstrumentValid

Some ReferenceFields and HistoryAwareReferenceFields were migrated to 
UIDReferenceField which uses simple StringFields to store the UIDs. The
usage of backReferences for the replaced references were factored out.After 
refactoring, the following references exis


BaseAnalysis
============
    Instrument                (UIDReferenceField)
    Method                    (UIDReferenceField)
    Calculation               (UIDReferenceField
    Category                  (UIDReferenceField)
    Department                (UIDReferenceField)
AnalysisService
===============
    Preservation              (UIDReferenceField)
    Container                 (UIDReferenceField)
    Instruments               (UIDReferenceField)
    Methods                   (UIDReferenceField)
Analysis
========
    Calculation               (HistoryAwareReferenceField
    Attachment                (UIDReferenceField)
    SamplePartition           (UIDReferenceField)
    OriginalReflexedAnalysis  (UIDReferenceField)
    ReflexAnalysisOf          (UIDReferenceField)
ReferenceAnalysis
=================
    Service                   (UIDReferenceField)
    Attachment                (UIDReferenceField)
    Instrument                (UIDReferenceField)
    Method                    (UIDReferenceField)
DuplicateAnalysis
=================
    Analysis                  (UIDReferenceField)
    Attachment                (UIDReferenceField)
    Instrument                (UIDReferenceField)