Search should support non-unicode search

[koppor]

I have a paper of a person having Képes as surname. If I search for Kepes, nothing is found. Searching for Képes hits something.

What about characters I cannot easily type on my keyboard? I would have expected that JabRef magically also hits umlauts if I key in the basic character.

[koppor]

The example should be Düsseldorf.

• Düsseldorf
• Duesseldorf
• D\"{u}sseldorf
• Dusseldorf

All variants can be stored in BibTeX - and the user can search using each variant - and there should be a hit!