Merge pull request #17 from nemerle/message_flow_work

Pull everything from nemerle's repo.
Merge pull request #18 from nemerle/master

Update to current state of test-server code.
Merge remote-tracking branch 'central/master'
Merge pull request #19 from nemerle/master

A few build system related simplifications
Merge branch 'master' of github.com:Segs/Segs
Fix finding/linking with OpenSceneGraph

A few other build related fixes.