Better handling of negation operators; should be clearer and more complete.
Expanded the basic get() test to cover the old operator/value syntax

It now does everything the old 09_create_get_complex2.t test used to do
Better handling of negated operators in SQL
Expand the test to cover all three means of handling operators

* in-memory (Index)
* bx-space (PropertyComparison)
* sql (RDBMS)