coodbms release 0.9.4

This release wraps up the common API and DRM cleanup:

• DRM factory now throws an exception when an unrecognized role is encountered.
• The DRM factory now works more like the CowDb factory when creating handles.
• DRM now uses the [more extensible] common eXpress logic.
• DRM handles ENTs the same way CowDb does.
• Setting the name or well known name now results in a call to the appropriate method in both the DRM and CowDb.
• The setMyName DRM method now checks for the prior use of the same name in the owner element.