[sailwave] Scoring - Average points

that is also our central problem (getting some people to do their duty), but
opportunists seem to be able to work the system to their advantage, if we
give them average points every time they volunteer for duty.- i.e. score well
in first couple of races and then don't race, can win with Ave. points-hence
the debate.
ps. thanks for all of your inputs, it has been very helpful to establish a
'custom and practice' view to incorporate into our SIs.