New operators for MidgardQueryBuilder

IN, NOT LIKE

I added these new operators to MidgardQueryBuilder constraints.
IN operator should be very usefull for functions or object methods which could replace old midgard xxx_in_tree functions.

Simple note and example is now available in Midgard wiki documentation.

What is very interesting I also found and resolved quite important QueryBuilder's bug. When SQL operator used with constraints was invalid, QB selected all records from object's table.

Additionally PHP's phpinfo function reports now MgdSchema technology used.