CRM-31: Implement contact groups  - refactored flexible datagrid manager to work with unknown attribute flexible types
CRM-31: Implement contact groups
 - refactored flexible datagrid manager to work with unknown attribute flexible types

geoffroycochard/platform,trustify/oroplatform,2ndkauboy/platform,mszajner/platform,akeneo/platform,trustify/oroplatform,2ndkauboy/platform,morontt/platform,trustify/oroplatform,orocrm/platform,orocrm/platform,morontt/platform,umpirsky/platform,Djamy/platform,geoffroycochard/platform,ramunasd/platform,geoffroycochard/platform,hugeval/platform,hugeval/platform,hugeval/platform,ramunasd/platform,orocrm/platform,mszajner/platform,northdakota/platform,northdakota/platform,Djamy/platform,akeneo/platform,akeneo/platform,2ndkauboy/platform,Djamy/platform,northdakota/platform,morontt/platform,mszajner/platform,ramunasd/platform,umpirsky/platform