From a beta tester six years ago: specifying 'scores:own' resulted
in an option setting of 'scores:3 top/2 around/own' when player
wanted 'scores:0 top/0 around/own'. Change it so that when fewer
than all three fields are given new values, the others are reset
rather than having their old values merge with new settings.
Also, 'scores:none' can be used to get 'scores:0 top/0 around/!own'
to skip the scores at the end without skipping notification of
whether the ending game's score made it into the top N list.
Options parsing accepts '!scores' and then ignores the negation.
Changing the optlist flags for 'scores' to allow negation resulted
in a complaint about missing value; I gave up instead of pursuing
that. 'scores:none' should suffice.
Setting 'scores:!top/own' or 'scores:!around/own' would behave as
'scores:1 top/!own' or 'scores:1 around/!own', respectively.
'scores:!top/!around/own' behaved as 'scores:1 top/1 around/own'
(note affect of two prior negations on final field compared to
single negation in the earlier two variations). This fixes those.
563ed2f7db