XBoard users are not used to options being persistent, and thus have
many scripts assuming the timeIncrement is -1 when they don't specify it
on the command line, and want to specify -mps. But a persistent -inc of
0 fom a preious session would then force their -mps to zero, causing
big-time confusion.
-saveSettingsOnExit true
-saveSettingsFile "~/.xboardrc"
-settingsFile "~/.xboardrc"
+;
+; Turn -inc into a volatile option, to prevent a persistent increment >= 0 dominating a command-line -mps
+;
+-inc -1