Fixes to the progdoc.
Inactive sticky neighbors have no scope.
Modified the neighbor cache to remember local addresses as well.
neighbor->scope now contains proper address scope which is zero (SCOPE_HOST)for local addresses, higher (SCOPE_LINK, ..., SCOPE_UNIVERSE) for remote ones.
Debugged printing and pruning of neighbor cache entries.
Fix stupid bug in neighbor cache.
if_connected() is again private.
Introduced neigh_connected_to() to serve the same purpose efficiently.
if_connected is usefull outside of neighbour cache.
Great cleanup of debug messages. LOCAL_DEBUG turned off in most modules,several debug() calls converted to DBG.
Reimplemented neighbor cache. Now uses real hashing.