Enhanced com.openexchange.admin.rmi.OXContextInterface by a new create() method accepting com.openexchange.admin.rmi.dataobjects.SchemaSelec tStrategy as a parameter.

That parameter offers three ways how the database schema for the new context is determined:
1. automatic (old behavior; schema gets created/selected on-demand)
2. in-memory (pre-filling an in-memory cache that can be used to determine the next suitable existing schema)
3. schema name (the specific schema name is given)