Check if timeline exists and when somebody tries to edit non existing timelime display error message. Add TODO regarding error message customization for Timeline. Add support for calendar widget in timeline for both gsoc and ghop programs (gsoc was hardcoded before).
Patch by: Pawel Solyga
Review by: to-be-reviewed
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"""This is a main Melange module which contains models, logic,
views submodules.
"""