Method unpackPlus

Read the next 6 bits from the buffer, and using the value read and the given codebook, rebuild LSP table. @param lsp @param tab @param bits - Speex bits buffer. @param k @param ti @param li

(final float[] lsp,
                            final int[] tab,
                            final Bits bits,
                            final float k,
                            final int ti,
                            final int li)