* Added a user-preference setting which disallows setting the current frame number to a negative number. This setting only applies when setting the current frame by scrubbing the time cursor in a timeline view, or by typing a value into the current frame number field.
* Made the minimum frame number for the start frame to be 0, which should make setting keyframes by a regular step size less confusing. Also changed the MINFRAME define to 0 for consistency. Hopefully this doesn't cause any problems with any output formats.
* Fixed some missing channel selection cases in animation editors.
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