Renamed AbsolutePath to Path and allow relative paths

Ignore-this: 5a1407c780b720ef7e94bec578e8578f

darcs-hash:20090422104850-1e3d8-f4b1e3c127db913fa1a93154a65e0cd06b1e3ddf
Disable SDP version checking in Session to accomodate incompliant devices

darcs-hash:20090422105131-58103-769190df2dc5dd21e73216b6b3bce351a4a425af