[DGD] Kernel library: 1.3.7

[Shentino]

Forgot to label and announce release 1.3.6, so here's a brief
changelog of what happened:

 - Return callouts as a trackable resource.
 - Fix callout accounting.
 - Rename some variables for compatibility with function pointers.
 - Correction to upgrade instructions, for those who wish to skip removal
   of callouts as a trackable resource.
 - Document the networking branch
 - Updated permission check for creating lightweight objects
 - Recognize and document the hotboot argument to shutdown() as well as the
   argument to dump_state()
 - Sanity check a shutdown before reporting anything in the log.
 - In the default error handler, don't assume that the connection
   object is directly connected to the user object.

Git download is here

git://github.com/shentino/kernellib.git