Output times now pushed correctly, updated logger and updated Scheduler interface.

• Updated so that output delta times must now be non-negative, they will be pushed as much as early as possible while still having the delta.

• Updated logger to better format with correct loglevels.

• Updated Scheduler interface.

• Added more parameter checks for ListScheduler.

• Added more tests.

Closes: #312 (closed) #304 (closed)

added Scheduling label

assigned to @simbj106

changed the description

approved this merge request

merged