Every time an API call is made via the store's own `api`
interface, a request counter is incremented. It is
decremented whenever a call completes, whether sucessfully
or not.
If the request counter is at zero, no requests are in
progress. This is exposed to the user via the `loading`
getter.
Calls made other than via the store's `api` interface
will not be registered. The user can choose to increment /
decrement the request counter manually via the relevant
store methods.
Still a work in progress. The recently viewed projects
list is meant to show the last three or so projects that
the user has visited on this computer, probably using localStorage.
It can show:
- all events (this could get slow);
- a single sequence;
- a set of sequences;
- a single date;
- a range between two dates.
It does not (yet) do pagination and filtering is local only.
