Remove the Checklist model from the Backend.
[WIP] Add ordering to ChecklistStep [touch: #2]
Merge branch 'simplify-models' into 2-checkliststep-order-field

Conflicts:
	db.sqlite3
	simchecklist/core/admin.py
[WIP] Experimenting with model structure.

- Adding slug fields
- Denormalise first_phase_slug onto Aircraft model
- Eliminate Checklist model (not sure if this is a good idea :/)
Add scrollToTop directive
[WIP] Bring back the Checklist model
Use SerializerMethodField to expose first phase slug on Checklist endpoint

Yey
Add PyCharm stuff to .gitignore
WIP
Fix get_first_phase_slug on aircraft serializer
Getting basic app working again

- Ensure aircraft has a one-one relation to Checklist
- Fix checklistService hitting wrong endpoint