API clean-up, documentation comments
ctkXnatScanResourceFile and ctkXnatReconstructionResourceFile unified to a single ctkXnatFile class
Unit test added for CTKXNATCore
XML Schema type property for ctkXnatObject
Schema type stored in ctkXnatObject
Shared/weak pointers removed in favour of explicit memory handling
ctkXnatObject::addChild renamed to add
XNAT Core refactorings and basic support for creating objects
Existance test support
ctkXnatAPI class (former qXnatAPI from the qRestAPI project)