t99: revert CM_Model_Abstract
t99: revert CM_Model_Abstract

fvovan/CM,vogdb/cm,alexispeter/CM,tomaszdurka/CM,njam/CM,cargomedia/CM,zazabe/cm,zazabe/cm,mariansollmann/CM,mariansollmann/CM,vogdb/cm,tomaszdurka/CM,zazabe/cm,njam/CM,tomaszdurka/CM,fvovan/CM,fauvel/CM,njam/CM,mariansollmann/CM,fauvel/CM,fvovan/CM,zazabe/cm,njam/CM,njam/CM,tomaszdurka/CM,christopheschwyzer/CM,alexispeter/CM,vogdb/cm,fvovan/CM,cargomedia/CM,vogdb/cm,fauvel/CM,vogdb/cm,fauvel/CM,mariansollmann/CM,cargomedia/CM,christopheschwyzer/CM,alexispeter/CM,cargomedia/CM,alexispeter/CM,christopheschwyzer/CM,christopheschwyzer/CM,fauvel/CM,tomaszdurka/CM