Added ctkXnatSession documentatioin.
Added ctkXnatSession documentatioin.

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