* Eraser size is now UserPref. This way it is more easily tweaked than using layer stroke-thickness squared, but it is less accessible.
* Restored stroke 'smoothing' (post-conversion) option as UserPref option. Off by default.
* Fixed bug with convert tools. Was adding an extra datablock everytime, that wasn't being used (and was subsequently dicarded).
* Moved pressure vars from paint-loop to temp-struct (during painting). Also, moved the macro which tests for converting straight lines.
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