Nyall Dawson cae8aae849 Add method to collate all used time ranges for layers in project
Unlike the existing methods, this new method does not return
a single overall time range, but rather (possibly with gaps)
containing all time ranges were we know data actually exists
in the project.
2021-03-25 13:35:52 +10:00
..
2021-03-22 21:13:52 +01:00
2021-03-22 21:13:52 +01:00
Dox
2021-03-25 04:48:31 +10:00
2021-03-22 21:13:52 +01:00