Add imports location lock to serialize non-atomic operations #204
+70
−12
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Adding and removing items from the imports location list is currently implemented in a non-atomic way, by first reading a list of items from the server, updating it locally, and sending a new list to the server.
Introduce a (per-resource, per-location) lock to all resources that require modifications of the import list so that those operations are done sequentially.
Closes: #203