Clean up ProcurementView class.
Admin: make 'manufacturer' and 'supplier' lists searchable.
Procurement form: Bugfix - supplier and incoterm values not set.
Procurement form: Bugfix - container and method selects not working.
PrAdmin: Bugfix - Medicine default sort causes list view to bomb out.
Procurement form: redirect to index view after successfull addition.
Admin: Bugfix - supplier and product selects not updating.
Update USD price after change in exchange rate field.
Procurement form: calculate unit price from other fields.
Procurement form: auto-populate end_date with value from start_date.
Update unit_price if pack_size changes.
Merge branch 'uploads' into develop

Conflicts:
	backend/admin.py
Remove unwanted console.log call
Return user to procurement index view after edit if no redirect url is set.
Procurement form: Add descriptions to fields.
Procurement form: change help text depending on selected product & container.
Procurement form: add link to currency conversion site.