Disable relation split warning

[NE2]

A role based relation was copied to all new ways.
You should verify this and correct it when necessary.

OK, I get it. You don't have to tell me every time I split one. Please add an option to disable these warnings.

(A similar message appears when you split a relation without a type; this too should be disableable.)

[stoecker]

This warning comes when the result is very likely wrong. It does not come for known situations, so tell us in which situation the warning should not appear and we add this to the checks.

The solution cannot be to disable the warning, as then users go in the "click OK and ignore mode" and produce wrong relations again as they did usually before the warnings have been added.

[NE2]

It happens every time I split a member of a route relation with a role. If you need an example, split way 93515189.

[stoecker]

In [4254/josm]:

fix #6601 - improve warning prevention - don't warn for roles outer, inner, forward, backward and add hidden preferences

[NE2]

It's not only those but also directions (north/south/east/west).

[NE2]

It this thing on? It was fixed for forward/backward but not directions (e.g. way 35393947).

[simon04]

In 5041/josm:

fix #6601, fix #6667 - SplitWayAction: improve warning prevention - don't warn for roles north/south/east/west