* `calendar_fill_gaps` - If set (and `calendar_autocreate` is set as well),
build calendar pages of emty years and months (but does not build pages older
than the older page, and younger than the younger page of the pagespec). If
* `calendar_fill_gaps` - If set (and `calendar_autocreate` is set as well),
build calendar pages of emty years and months (but does not build pages older
than the older page, and younger than the younger page of the pagespec). If