Added a bunch of operator interpretations
Added a bunch of operator interpretations

rbock/sqlpp-concepts-experiments,rettichschnidi/sqlpp11,rbock/sqlpp-concepts-experiments,rettichschnidi/sqlpp11,sergeken/sqlpp11,happybits/sqlpp11,rbock/sqlpp11,coldzhang/sqlpp11,rbock/sqlpp-concepts-experiments,volka/sqlpp11,coldzhang/sqlpp11,sergeken/sqlpp11,rettichschnidi/sqlpp11,volka/sqlpp11,coldzhang/sqlpp11,happybits/sqlpp11,happybits/sqlpp11,rbock/sqlpp11,volka/sqlpp11,volka/sqlpp11,sergeken/sqlpp11,rbock/sqlpp11,happybits/sqlpp11,rbock/sqlpp11,rettichschnidi/sqlpp11,sergeken/sqlpp11