Correct matches not treated as candidates as names seem too different

[hbruch]

Possible match candidates are ignored, if their names are very different, e.g. their bigram comparison is less then (currently) 0.3.
In cases like e.g. Urbach (de:08119:5789:1:1) Urbach (b Schorndorf) (n61278864) location specifiers in parentheses reduce the bigram equivalence value below the threshold and the match candidates are ignored:

2023-01-07 10:41:16 INFO     Ignore Urbach (de:08119:5789:1:1)  Urbach (b Schorndorf) (n61278864) with distance 49.98712924591864 and name similarity 0.2857142857142857. Platform matches? 0.85 as name distance low

We should possibly normalize osm and stop names, e.g. by scrubbing parentheses and insignificant name parts.

[derhuerst]

db-clean-station-name has been built specifically to remove these (b *) suffixes, among other cleanups. But currently, it fails with Urbach (b Schorndorf).