Function SCIPwritePpm 

pub unsafe extern "C" fn SCIPwritePpm(
    scip: *mut SCIP,
    file: *mut FILE,
    name: *const c_char,
    readerdata: *mut SCIP_READERDATA,
    transformed: c_uint,
    vars: *mut *mut SCIP_VAR,
    nvars: c_int,
    conss: *mut *mut SCIP_CONS,
    nconss: c_int,
    result: *mut SCIP_RESULT,
) -> SCIP_RETCODE

writes problem to file