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* Permit NULL values in first row when creating SQL tables (but warn as this is
not encouraged)
* Permit sources and targets to be used outside of context handlers (makes
experimentation in the REPL a bit nicer)
* Don't warn when request is NULL in Apache log sources (in certain
configurations this is common when stringent timeouts are set)
* Fixed incorrect generation of Oracle multi-row INSERT statements
* Fixed operation of SQL target when row doesn't cover complete set of target
table rows