Performance improvements, new optional interfaces, and dataset support.

• Performance is now very much comparable, sometimes better, than DataSets.
• Objects should implement IObjectHelper to achieve the best performance.
• Objects can implement IObjectNotification to handle persistence events.
• A new method GetDataSet was created for situations where it is desired.
• The ordering of fields in the xml mapping file is now retained internally.
• Bug Fix: Table names with special characters (space, underscore) work.
• ORHelper: Optionally implements IObjectHelper and/or IObjectNotification.
• Documentation: Now includes a new column to indicate if part of MS syntax.