Debugging for removing the locks in calling pattern matcher.
Merge branch 'master' of http://github.com/opencog/opencog into PM
Removed a lock , raised the speed of mining
Merge branch 'master' of http://github.com/opencog/opencog into PM
Test Linas's fix  #1026
Rewrite the 2-atomspace code to use nested atomspace.
Changed 1-gram index order. Changed flush progress output .
Merge branch 'master' of http://github.com/opencog/opencog into PM
Changed a lock position.
removed some debug output.
Merge pull request #1034 from shujingke/PM

Finished improving efficiency.
Merge remote-tracking branch 'refs/remotes/upstream/master'