Tweaking manager/simulate.py, updating manual and webpage

You can now pass arguments to your AI through the manager program.
Simply include the path to the AI and arguments in quotation marks.

EG:
./stratego "../../agents/foo/bar --debug" ../../agents/other/agent

simulate.py was making broken links to log files, fixed.

Logging of stderr! If anything is printed to stderr, it is all saved in logfilename.stderr by simulate.py

Tried to make the manual page better, probably failed.

Updated webpage since we have now changed the date.

Also tried to fix vixen again, haven't tested.