Removed obsolete code in cut_bs.py

SID_BITS = {35, 48, 104}

SYNC_WORDS = {b"!k", b" k"}

def cut_to_length(fp, fp_out, length):

    assert length > 0

    fr_cnt = 0

    for f in range(length):

        sync_word = fp.read(2)

        if sync_word == b"":

            return fr_cnt

        if sync_word not in SYNC_WORDS:

            raise ValueError("Bad Sync word!")

        n_bits_bs = fp.read(2)

        n_bits = struct.unpack("h", n_bits_bs)[0]

        fp_out.write(sync_word)

        fp_out.write(n_bits_bs)

        fp_out.write(fp.read(n_bits * 2))

        fr_cnt += 1

    return fr_cnt

def cut_from_start(fp, fp_out, start_frame=0, length=-1, start_with_sid=False):

    # cut until start frame

    fr_cnt = 0