* previously, this check was based on the "fraction" of the respective tag value, which excluded more values for common tag keys, but fewer for less common ones.
* this sets a limit of 100 uses for undocumented tags (key=value pairs)
* tags with a wiki page are always allowed
* this harmonizes the heuristic of which tags to show between preset fields and the raw tag editor (previously, there was an additional `count > 10` filter present in combo fields, which is now uncessary)
closes#9227
a2cacaaf24