Support uncheckable header in ctkCheckableHeaderView
Support uncheckable header in ctkCheckableHeaderView

fedorov/CTK,pieper/CTK,rkhlebnikov/CTK,danielknorr/CTK,ddao/CTK,espakm/CTK,naucoin/CTK,finetjul/CTK,laurennlam/CTK,151706061/CTK,laurennlam/CTK,msmolens/CTK,Heather/CTK,rkhlebnikov/CTK,Sardge/CTK,jcfr/CTK,AndreasFetzer/CTK,pieper/CTK,commontk/CTK,danielknorr/CTK,msmolens/CTK,CJGoch/CTK,mehrtash/CTK,mehrtash/CTK,SINTEFMedtek/CTK,vovythevov/CTK,finetjul/CTK,espakm/CTK,sankhesh/CTK,CJGoch/CTK,SINTEFMedtek/CTK,espakm/CTK,pieper/CTK,151706061/CTK,jcfr/CTK,Sardge/CTK,laurennlam/CTK,msmolens/CTK,naucoin/CTK,AndreasFetzer/CTK,pieper/CTK,msmolens/CTK,SINTEFMedtek/CTK,Heather/CTK,sankhesh/CTK,rkhlebnikov/CTK,laurennlam/CTK,Sardge/CTK,vovythevov/CTK,finetjul/CTK,151706061/CTK,Heather/CTK,jcfr/CTK,jcfr/CTK,commontk/CTK,mehrtash/CTK,Heather/CTK,commontk/CTK,lassoan/CTK,ddao/CTK,ddao/CTK,naucoin/CTK,lassoan/CTK,finetjul/CTK,naucoin/CTK,vovythevov/CTK,mehrtash/CTK,jcfr/CTK,AndreasFetzer/CTK,sankhesh/CTK,151706061/CTK,lassoan/CTK,vovythevov/CTK,CJGoch/CTK,sankhesh/CTK,Sardge/CTK,fedorov/CTK,ddao/CTK,AndreasFetzer/CTK,espakm/CTK,commontk/CTK,danielknorr/CTK,fedorov/CTK,danielknorr/CTK,fedorov/CTK,SINTEFMedtek/CTK,CJGoch/CTK,151706061/CTK,rkhlebnikov/CTK,lassoan/CTK,CJGoch/CTK,SINTEFMedtek/CTK