Search function improvements

ULBD have had a long-open ticket about search function improvements / issues. This is specifically around the strictness of the search, inability to user jokers/wildcards and working with special characters.

"I’ve tested the search function over at ZIF and it’s working well. I just figured out you cant use jokers if you are unsure about the spelling (like Renner = re?er). Also the search is quite strict. It does not forgive missing letters. If I type in „renne“ I get zero results, only „renner“ will show me the article. This is also the issue for other themes."

"I just wanted to know If any improvements have been made. One journal reported some issues, like searching for the author "Kursiša":
If you fill in "Kursisa" without the special character there is no hit. You have to type the exact phrase. You also have to deactivate all other search options besides "seach authors" to find all articles, which is really strange."

We may need to invesitgate if we can match special character with their regular cousins / do some fuzzy matching?

This links to: https://janeway.freshdesk.com/a/tickets/5198

It has been requested by Andy this is top of BARF for 31/07.

Start by reproducing the reported searches for “re?er”, “renne”, and “Kursisa” against the current search interface, including the author-only option. Then locate the search implementation and its tests; done means the intended wildcard, partial-match, special-character, and search-option behavior is documented and covered by tests.