Adding btrie code and test
Patching pa_data
Patching pa
btrie now included
Optimizing pa.c
Optimize pa.c again
Optimizing pa_core.c
Fixing a potential bug when using prefix_increment with addresses
Optimizing pa_local.c
Optimizing pa_pd
Use the btrie in a pa_core loop
Optimize ignore dp computation
Merge branch 'master' into btrie