make the slider go from 0 to 1 inclusive (even with the off option) for tracks and weather.  consistent with existing and unhidden value means ever slightly less unexpected.
make the slider go from 0 to 1 inclusive (even with the off option) for tracks and weather.  consistent with existing and unhidden value means ever slightly less unexpected.

git-svn-id: 67bf12f30ddf2081c31403e0b02b2123541f1680@9530 08b3d480-bf2c-0410-a26f-811ee3361c24

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