add distributed
added callback function to the metrics xml
added callback functions to the xml of metrics
added callback function to the encoder,metrics,viterbi,and viterbi combined
Merge branch 'trellisupdates' of https://github.com/fengzhe29888/gnuradio-git into trellisupdates
Merge pull request #1 from fengzhe29888/trellisupdates

Trellisupdates from Zhe