- Create generic (optional) caching mechanism in base class.
- Replace VoyagerRestful session-based caching with new generic mechanism.

- Thanks to @Cloud8 and @lahmann
- Resolves PR #612.

- This enables PDO to properly escape data sent to the bytea search_object field.
- Includes test scenario to prevent regressions.

- More specific check on return value for file_get_contents().

- We need to base DOM IDs on the FULL, UNIQUE identifier, not just the search class; otherwise, multiple filtered views of the same search backend will yield duplicate IDs.

- There was a race condition where multiple parallel requests could end up with a fatal error caused by one process retrieving the partially created row generated by another process and trying to unserialize an empty string. By waiting to write the session ID to the database until we also have the data available, we can avoid this problem.

Handle defaultRequiredDate properly for ILL requests.

- Resolves VUFIND-1152.

Fixed the local check call when fetching remote holds.

- Replace getters with public properties for simplicity/perforamnce.

- Adjusted wiki links to point to latest URLs.
- Removed VuFind2 category name (use generic VuFind instead).

- Adds possibility to disallow canceling of requests that are available for pickup
- Fixed minor debug-related error

Fix AJAX fail handlers to not cause JS errors if responseJSON is not …