BTreeMap: remove dead code used for debugging
BTreeMap: remove dead code used for debugging

jankotek/mapdb,hangum/mapdb,cocosli/mapdb,jankotek/MapDB,binarytemple/mapdb,olupas/MapDB,sumit784/mapdb,ringoluo/mapdb,mebigfatguy/mapdb,pettermahlen/mapdb,lamfire/mapdb,mebigfatguy/mapdb,jankotek/MapDB,SleimanJneidi/mapdb,olupas/MapDB,jankotek/mapdb,morfeo8marc/mapdb,ffjiao/mapdb,codeaudit/mapdb