Added send_sync_start() to send a tag downstream to inform thet a sync has been acquired
Demod reference signals now waits for a signal that the sync has been acquired and waits until the start symbol index is multiple of 4. After that it sends the calculated symbol index downstream
In symbol deinterleaver get only the symbol_index tags from the stream
Small change in Viterbi code for the non SSE2 code
Changed the block size of Viterbi decoder from 512 to 768 in order to accomodate 2k FFT, QPSK, 16-QAM, 64-QAM and rates 1/2, 2/3, 3/4, 5/6, 7/8. Now all above parameters works for both TX and RX