sync CHANGES
bump version
Several improvements and interface changes in Manager.
Removing a warning for unused variable.
Updated CHANGES.
[doc] Change the display order for modules in the index page, add a title for each documented module.
[doc] Added doc to module Channel (direct backend).
sync CHANGES for 0.9.3
bump to 0.9.3
mirage-net now depends on ocaml-ipaddr, removal of duplicated code and adaptation.