Added note about model group conversion to updater readme. 
Added note about model group conversion to updater readme. 
alkacon/opencms-core,ggiudetti/opencms-core,ggiudetti/opencms-core,alkacon/opencms-core,gallardo/opencms-core,gallardo/opencms-core,gallardo/opencms-core,alkacon/opencms-core,ggiudetti/opencms-core,alkacon/opencms-core,ggiudetti/opencms-core,gallardo/opencms-core