TestSetUniqueTogether: fix sqlite test expectation (force err string to lower)
Add support for alias column
Modified Pre/Post functions into using interface
Add Pre/Post functions to godoc
Merge branch 'upstream_develop' into query-plans
Use 'fetch next [count] rows only' instead of 'limit [count]', as per the SQL spec.  This will break mysql support, but that's not exactly a bad thing.
variables in 'fetch next n rows' must be in parenthesis