refs #100345  Document intended behavior of the new CCN_FORW_CAPTURE_OK ForwardingFlags.
refs #100345  Document intended behavior of the new CCN_FORW_CAPTURE_OK ForwardingFlags.

Separation of this into a flag of its own means that some of the previous
special treatment of CCN_FORW_LAST and CCN_FORW_TAP can be removed.

ebollens/ccnmp,svartika/ccnx,cawka/ndnx,svartika/ccnx,svartika/ccnx,svartika/ccnx,svartika/ccnx,cawka/ndnx,cawka/ndnx,cawka/ndnx,ebollens/ccnmp,svartika/ccnx,ebollens/ccnmp,cawka/ndnx,svartika/ccnx,ebollens/ccnmp