TODO


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* See
  https://groups.google.com/d/msg/sqlparse/huz9lKXt0Lc/11ybIKPJWbUJ
  for some interesting hints and suggestions.
* Provide a function to replace tokens. See this thread: https://groups.google.com/d/msg/sqlparse/5xmBL2UKqX4/ZX9z_peve-AJ
* Document filter stack and processing phases.