Check makeDynamicCovers setting so that false actually works (ini rea…

Fixed a PHP notice when adding a record to a list with tags disabled.

Fixed cache member variable name conflict with base class in MultiBac…

Fixed cache member variable name conflict with base class in MultiBackend driver and simplified the driver instantiation.

Fixed ILS driver caching so that existing entries are updated.

- Bad interaction between Zend\Session\Container and proxy manager caused many notices.
- Came up with simpler mechanism for deferring Demo driver container instantiation.

Fixed fi and sv translation of Zip.

- Rewrote Javascript to make better use of server-side logic
- Eliminated many server-side special cases specific to lightbox handling
- Adjusted test suite to accommodate improvements

- Refactored use of Zend\Session\Container to inject proper session manager
- Introduced "on demand session container" mechanism for non-critical session data (only used by Demo ILS driver for now)
- Changed controllers to retrieve authorization service on demand rather than through injection (to defer session load)
- Replaced \VuFind\Controller\AbstractBase::writeSession() with \VuFind\Controller\AbstractBase::disableSessionWrites (and new related mechanism for safer AJAX session utilization)
- This makes sessions "on demand" which improves performance of requests that do not depend on session data (e.g. cover images, some AJAX calls).

corrects check for existence of ilslink

- 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.