warning: numerical key in tag

[Oli-Wan]

The Validator displays a warning for certain "strange" keys. The catalogue should include keys which are purely numerical, such as 158=162. This can happen e.g. in housenumber mapping when one changes the key instead of the value (JOSM's new behaviour of setting focus to the "key" field in the edit window after a double-click on the left half of the tag list makes it easy to commit this mistake.)

In short: check tag keys for ^[[:digit:]]+$ (don't know if Java likes this syntax).

[Don-vip]

In 6186/josm:

fix #8543 - new tagchecker warning: numerical key