Add presets for amenity=watering_place

[Hufkratzer]

Please add presets for amenity=watering_place (German: Wasserstelle, Tränke). As decribed on the wiki page it's similar to amenity=drinking_water , just primarily for animals. Status is approved and usage is more than 2.850 (and nearly twice as frequent as for amenity=sanitary_dump_station what is in the presets).

URL:http://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2016-09-06 00:16:07 +0200 (Tue, 06 Sep 2016)
Build-Date:2016-09-05 22:21:00
Revision:10966
Relative:URL: ^/trunk

Identification: JOSM/1.5 (10966 de) Windows XP 32-Bit
Memory Usage: 123 MB / 989 MB (64 MB allocated, but free)
Java version: 1.8.0_91-b14, Oracle Corporation, Java HotSpot(TM) Client VM
Screen: \Display0 800x600
Maximum Screen Size: 800x600
Dataset consistency test: No problems found

Plugins:
+ PicLayer (32796)
+ apache-commons (32699)
+ scripting (30760)

Tagging presets:
+ https://josm.openstreetmap.de/josmfile?page=Presets/NewTags&zip=1

Map paint styles:
- https://josm.openstreetmap.de/josmfile?page=Styles/MTB&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Surface&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Surface-DataEntry&zip=1