* Use the safe_load function to load YAML instead of the unsafe default (patch by Paul Wise).
* Return the real thrust value, not the squared value.
* Fixed system.adjacentsytems(). Hidden and exit-only jumps broke the Lua stack.
* Do not use misn module in events.
* Better error message for hook failure due to usage outside missions or events.
Merge branch 'master' of git://github.com/bobbens/naev