Suggest: Don't override existing company if generated slug for new company suggests happens to overlap

[baltpeter]

Examples of where this happened recently:

• Add 'Oracle Hospitality' (community contribution) data#907
• Add 'Wolters Kluwer N.V.' (community contribution) data#922

[mal-tee]

another one: datenanfragen/data#970

[baltpeter]

Not really the right place for this but with regards to datenanfragen/data#970, it would be really nice if website had a "We already have these similarly named companies: <>" kind of thing.

[mal-tee]

I totally agree!