Fix for jira issue MONDRIAN-1056. Preventing a MondrianOlap4jConnection
from loading all schemas.
* MondrianOlap4jDatabase now lazily loads its catalogs.
* MondrianOlap4jCatalog now loads schemas only upon a getSchemas call.
* MondrianOlap4jConnection lazily loads its schemaMap.
* FileRepository sets the CatalogName property when creating its
* connection.