NOTA  testing MEAS branching. Each kind 2 measurement doubles number of state vectors
PRINT V1
SIGX	AT	0	IF	2F
PRINT V1
HAD2    AT  1
HAD2    AT  2
HAD2    AT  3
MEAS    0   AT  1
SIGX	AT	0	IF	1F
SIGX	AT	0	IF	1T
MEAS    2   AT  3
MEAS    2   AT  2
IF_M( 3F 2F ){
SIGX	AT	0
}IF_M