Fix SPK_CONFLICT support
Fix SPK_CONFLICT support

Generates "install_conflict_packages" in INFO file
Closes #2893

saschpe/spksrc,saschpe/spksrc,sangood/spksrc,sangood/spksrc,sangood/spksrc,sangood/spksrc,saschpe/spksrc,saschpe/spksrc,saschpe/spksrc,sangood/spksrc,saschpe/spksrc,sangood/spksrc,sangood/spksrc,saschpe/spksrc,sangood/spksrc,saschpe/spksrc,saschpe/spksrc,sangood/spksrc