* Reduce to one search bar.

- All files reported by licensecheck[https://metacpan.org/pod/App::Licensecheck] were fixed.

- Resolves VUFIND-1167 (OpenUrl-Resolver in HoldingsTab not embedded when loadInitialTabWithAjax=true)
- Includes refactoring of openurl.js to use new "VuFind namespace object plug-in" format.
- Includes test

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