Improve output of ccn_btree_check to be more comprehensable. Also check more things.
Improve output of ccn_btree_check to be more comprehensable. Also check more things.

cawka/ndnx,ebollens/ccnmp,cawka/ndnx,cawka/ndnx,ebollens/ccnmp,svartika/ccnx,svartika/ccnx,ebollens/ccnmp,svartika/ccnx,ebollens/ccnmp,svartika/ccnx,svartika/ccnx,cawka/ndnx,cawka/ndnx,svartika/ccnx,svartika/ccnx