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Warnings should be raised when a command line option has no effect,
for example...

pvengine +am

is legal, but without the number after it, it has no effect.

pvengine +am7

should be an error, and also raises no warnings.

The #debug message stream is only being flushed when it hits a newline character,
instead of after each #debug statement. This means that some final strings don’t show up.

#debug "This line prints,\n but this line doesn't."

When changing the behavior of the render window, “Keep above main”, requires restarting the POV editor to take effect. It would be nice either to get a warning to restart, or to get it to work without restarting.