Replace geometry: Optional setting handling for membership conflicts

[skyper]

What steps will reproduce the problem?

1. Have an object part of an associatedStreet relation and a new object without any tag/membership
2. Replace geometry
3. Tag/Membership Conflict window always appears cause of the membership conflict

I need an option to better handle the different membership conflicts and for replace geometry I would like to be able to set "keep" for certain relation types.

Updating/Replacing buildings I face this window 100s times only to set the membership to keep.

Not sure if this is better implemented into core or if utilsplugin2 should extend the core function but I think this would be useful for more than only replace geometry

URL:http://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2016-12-31 00:04:03 +0100 (Sat, 31 Dec 2016)
Build-Date:2016-12-31 02:32:34
Revision:11421
Relative:URL: ^/trunk

Identification: JOSM/1.5 (11421 en) Linux Debian GNU/Linux 8.6 (jessie)
Memory Usage: 516 MB / 882 MB (209 MB allocated, but free)
Java version: 1.8.0_111-8u111-b14-2~bpo8+1-b14, Oracle Corporation, OpenJDK 64-Bit Server VM
Java package: openjdk-8-jre:amd64-8u111-b14-2~bpo8+1
Java ATK Wrapper package: libatk-wrapper-java:all-0.30.4-3
Program arguments: [--language=en]
Dataset consistency test: No problems found

Plugins:
+ utilsplugin2 (33088)

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

Last errors/warnings:
- W: Invalid jar file ''<josm.userdata>/plugins/utilsplugin2.jar.new'' (exists: false, canRead: false)
- W: Unable to get color from '' for color preference 'extrude.main.line'
- W: Unable to get color from '' for color preference 'improve.way.accuracy.helper.line'
- W: Unable to get color from '' for color preference 'make.parallel.helper.line'