Listly: navigating to next page on list often hangs

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In a number of cases, navigating to a next page of a list caused the application to hang. These issues were removed. Together with this fix, some small improvements were added to the paging mechanism:
– the next/previous buttons are disabled when there is already a paging request in progress
– if the requested page already exists in the client-side cache, then the system will not perform a call to the server and use the cached data instead