full updates on gr-cdma

Hi Professor,

I've finished cleaning the first stage of gr-cdma. I've confirmed every feature of cdma_txrx1 worked properly. To enable the feature of switching between different type of tcm types, the callback functions of repack_packet are needed. I was trying to send you another pull request of the trellisupdates regrading the addition of callback functions of repack_packet. But I met a merge conflict with your latest trellisupdates changes. I'm still trying to work out the merge conflict. So I want to send this to you for your check. 

I'll also try to test all the features of gr-trellis to confirm it works correctly. 

Best,
Zhe