* Allows schedule by cluster
* Update docs
* Add example in doc
* Fixes cluster field must be blank
* Adds cluster arg to schedule func
* Adds cluster field in list_display/filter for admin
* Uses Q filter to fetch schedule
* Fixes ref in doc
* Adds tests
The test suite, especially for the brokers, was heavily dependant on the
success of the tests preceeding it to pass. This commit should eliminate
that dependency and allow tests to fail without affecting others.
It also removes the need to cleanup globals manually after a test.
When a cluster hasn't run for a while, the default behavior is to keep executing schedules until they are caught up with the present time.
By setting `catch_up` to False, schedules will not play catch up and instead get rescheduled to the future.
The core module was becoming too large.
By splitting it in cluster, monitor and tasks it becomes more manageable. It also reflects the documentation structure.
Workers now share a ctype with the sentinel to indicate if they are currently executing a task. This timer is incremented each guard loop until the worker resets it after finishing a job or until it reaches the TIMEOUT value and the worker is terminated by the sentinel.
Dimitri