Viterbi Decoder (AXI4-Stream compliant)

The testbench provides blocks of data to the Viterbi decoder, however if the input block is divided into two seperate blocks, there will be an error at the divided place.

data <=1=><=2=><=3=><=4=>-----<=5=><=6=><=7=><=8=> valid -------------------|_|------------------- last ___|----| error __|----|_

well, my ASCII graphic doesnt work, try again.

data_ <=1=><=2=><=3=><=4=>-----<=5=><=6=><=7=><=8=> valid -------------------|_|------------------- last_ ___|----| error __|----|_

Well, error at 4th data where the block got divided.

Thats for the report, there is now a new version within the trunk repository, which should solve this issue.