Berthold Stoeger 1971cfad54 undo: implement set point change undo command
This is a simple copy of the other add-event commands. It could
be made more friendly by stating the pO2 value in the text.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
2020-04-07 00:13:35 +02:00
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