Added support for modulus operator in expressions

Issue 288: Some right outer join queries failed to produce the correct result or threw exceptions such as "column x must be in the group by list". Some right outer joins with invalid column referenced (typos) threw a NullPointerException instead of "column not found" exception.

New database setting EARLY_FILTER to allow table implementations to apply filter conditions early on.

Cluster: in a two node cluster, if cluster node stopped, and autocommit was enabled, then changes on the remaining cluster node didn't get committed automatically.

Issue 290: Conditions using subqueries were sometimes evaluated before much simpler conditions, which was very bad for performance. This includes subqueries returning a value, EXISTS subqueries, and IN(SELECT ..) subqueries.