of course, sysop is implicitly a user and you restricted the user's rights.
simply ad this :
$wgGroupPermissions['sysop']['move'] = true;
$wgGroupPermissions['sysop']['read'] = true;
$wgGroupPermissions['sysop']['edit'] = true;
$wgGroupPermissions['sysop']['createpage'] = true;
$wgGroupPermissions['sysop']['createtalk'] = true;
$wgGroupPermissions['sysop']['talk'] = true;
$wgGroupPermissions['sysop']['upload'] = true;
$wgGroupPermissions['sysop']['reupload'] = true;
$wgGroupPermissions['sysop']['reupload-shared'] = true;
$wgGroupPermissions['sysop']['minoredit'] = true;
sorry for not mentionning that point at first time ;-)
Interestingly, once it was in place, I couldn't
even edit as sysop and
bureaucrat, I had to make myself an editor, too. :-D