railway=level_crossing should suppress warning about missing railway=crossing

[julianladisch]

What steps will reproduce the problem?

1. Have a highway=residential with highway=cycleway in parallel. A railway=rail crosses both, each crossing point is marked as railway=level_crossing:

​https://www.openstreetmap.org/#map=19/51.54227653295483/9.903142078151385

2. Run core validator.

What is the expected result?

No complain about railway=level_crossing at the cycleway because residential and cycleway together can be seen as a big level_crossing.

What happens instead?

Missing tag warning: pedestrian railway crossing without railway=crossing

Please provide any additional information below. Attach a screenshot if possible.

Suggested fix: Suppress warning about missing railway=crossing if railway=level_crossing exists:
https://josm.openstreetmap.de/browser/josm/trunk/data/validator/highway.mapcss#L121

URL:http://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2016-11-06 20:18:38 +0100 (Sun, 06 Nov 2016)
Build-Date:2016-11-06 21:45:03
Revision:11223
Relative:URL: ^/trunk

Identification: JOSM/1.5 (11223 en) Linux openSUSE 13.2 (Harlequin) (x86_64)
Memory Usage: 267 MB / 455 MB (158 MB allocated, but free)
Java version: 1.8.0_101-b13, Oracle Corporation, OpenJDK 64-Bit Server VM
Screen: :0.0 1600x900
Maximum Screen Size: 1600x900
Java package: java-1_8_0-openjdk:x86_64-1.8.0.101
Dataset consistency test: No problems found

Plugins:
+ HouseNumberTaggingTool (32699)
+ PicLayer (32796)
+ RoadSigns (32796)
+ buildings_tools (32944)
+ reverter (32796)

[naoliv]

highway=cycleway is a pedestrian way ​https://wiki.openstreetmap.org/wiki/Pedestrian#Pedestrian_ways_independent_from_a_street

​railway=crossing says exactly this: a point where pedestrians may cross a railway

By supressing the warning when railway=level_crossing exists it won't catch wrong pedestrian crossings marked as railway=level_crossing