This class is loaded by the Derby Plugin and registered with all Derby
Sessions as the query tokenizer if the plugin is loaded. It handles some
of the syntax allowed in ij scripts that would be hard to parse in a
generic way for any database. Specifically, it handles "run 'script'"
commands which
author: manningr
setFactory() Sets the ITokenizerFactory which is used to create additional instances
of the IQueryTokenizer - this is used for handling file includes
recursively.