RMI server error handling

All error conditions generated by the IBM Transformation Extender Programming Interface are wrapped and re-thrown as RMI API exceptions.

These include various map, adapter, and internal failures. Errors generated by the RMI server are also thrown as RMI API exceptions as well as all unexpected error conditions. Low-level RMI and network-related exceptions are passed unchanged to the client. The MRmiApiException class has a list of RMI server-specific error conditions.