Make sure ctkDICOMAbstractThumbnailGenerator is not wrapped
Make sure ctkDICOMAbstractThumbnailGenerator is not wrapped

* Since class having virtual pure method can't be instantiated, we need
to make it's not wrapped.

* Ideally we should fix the wrapping macro which are suppose to discover
if a class has virtual pure method.

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