Version 0.5.1

Launched on 2020/10/18

This version introduces:

• Recurring tasks can have active intervals. Only during this interval will inbox tasks be generated. This can be open ended of course.
• Inbox tasks from recurring tasks now have the year included in the name.
• Reporting on habits also shows a "completion ratio" broken down by sub-periods.
• Inbox tasks now have an actionable date. They'll be visible to work on one week before this. Recurring tasks have been updated to allow generation of such fields too.
• Fix a timezone issue with recurring tasks generation.
• Fix an issue with smart list syncing which caused every smart list to contain every smart list item.