Function SCIPtreeStartProbing 

pub unsafe extern "C" fn SCIPtreeStartProbing(
    tree: *mut SCIP_TREE,
    blkmem: *mut BMS_BLKMEM,
    set: *mut SCIP_SET,
    lp: *mut SCIP_LP,
    relaxation: *mut SCIP_RELAXATION,
    transprob: *mut SCIP_PROB,
    strongbranching: c_uint,
) -> SCIP_RETCODE

switches to probing mode and creates a probing root