@amaclin: if the tests for standardness on testnet are not implemented, why is the error
"mandatory-script-verify-flag-failed" happening?
Invalid signature?

Bug in code?

I am too lazy to check. And I have a right for mistake.
I think that consensus code permits such scripts for redeeming
pk1=mqBRdBj2aen8aM3t8vtuSdiQLh2kSDZZfc
pk2=mwyjowbdKK9QHK6nGHTS8HoNEsULxCbNce
pk3=mqxmeXoLf3ANX6fY1epLZEHcnNvr1rYPMA
These are addresses. One have to know private keys (2-of-3) to redeem