refs #5155 refs #5308 closes #5309 merge new omt api functions to main (still unused), use templated omt for TOKUTXN->open_fts, OMT becomes a wrapper for omt<OMTVALUE>, other misc fixes

git-svn-id: file:///svn/toku/tokudb@46448 c7de825b-a66e-492c-adef-691d508d4ae1