[v3] policy-based data structures, round two

[David Edelsohn]

	New AIX pb_ds failures:

The distance from 0 to 0 is 0
The distance from 0 to 2 is 3
FAIL: ext/pb_ds/example/priority_queue_dijkstra.cc execution test


/farm/dje/src/src/libstdc++-v3/testsuite/ext/pb_ds/example/trie_prefix_search.cc:79:   instantiated from here
/tmp/20060614/powerpc-ibm-aix5.2.0.0/libstdc++-v3/include/ext/pb_ds/detail/pat_trie_/internal_node.hpp:164: error: invalid application of 'sizeof' to incomplete type 'pb_ds::detail::static_assert<false>'
FAIL: ext/pb_ds/example/trie_prefix_search.cc (test for excess errors)


/farm/dje/src/src/libstdc++-v3/testsuite/ext/pb_ds/example/trie_split.cc:65:   instantiated from here
/tmp/20060614/powerpc-ibm-aix5.2.0.0/libstdc++-v3/include/ext/pb_ds/detail/pat_trie_/internal_node.hpp:164: error: invalid application of 'sizeof' to incomplete type 'pb_ds::detail::static_assert<false>' 
FAIL: ext/pb_ds/example/trie_split.cc (test for excess errors)


	The other information about the specific template printed with the
compilation errors are very long.  I can post if people want or send
privately.

David