* Use enum for frequency in task model
* Adjust ui of task selection
* Correct check for hasStarted
* Remove semicolons
* Set default start day to today
* Correct perfect day and resting in inn tests to have dailies with start dates of a week ago
* Add tests for dailies/weeklies functionality
- shouldDo() now takes the entire task as an input instead of just the ‘repeat’ (days of the week) dictionary.
- the ‘start’ date for a task can be specified (and can also be in the future, in which case it will be greyed out until then.) ‘start’ date also affects ‘every X days’ and ‘every X weeks’.
- no migration code yet.
