times can be negative

[drekdrek]

there used to be a bug where times could be saved as negative, this leads to a really out of wack time in the file

things to do:

• add an option to reset a map's data from the settings
• add an option in recap to delete a map's setting, maybe by shift clicking a map's name (will need a confirmation message)

[drekdrek]

this is a little more complicated than just making the time positive