#7 'PropertySetFactory' should be create on a per configuration basis

[Will Gilbert]

Currently 'PropertySetFactory' is implemented as a Singleton. However, it is configured via the OSWf XML configuration files. These file contain may contain different sets of PropertySet parameters. As such, the PropertySetFactory should be instance within the OSWfConfiguration used to create each OSWfEngine.

This will only impact some of the Unit tests which use named PropertySet and it will affect some of the 'Loader' classes such as JDBCLoader which have named PropertySets in their implementation.