Second part of the JENKINS-6439 fix.

Signed-off-by: Matthias Kraft <Matthias.Kraft@softwareag.com>

label axis

Conflicts:
	core/pom.xml
	core/src/main/java/hudson/model/Node.java
	test/src/main/java/org/jvnet/hudson/test/HudsonTestCase.java

Conflicts:
	core/src/main/resources/lib/form/optionalBlock.jelly
	core/src/main/resources/lib/hudson/newFromList/form.jelly
	test/src/main/java/org/jvnet/hudson/test/HudsonTestCase.java

Conflicts:
	test/src/main/java/org/jvnet/hudson/test/HudsonTestCase.java

Conflicts:
	changelog.html

- support invisible JobProperty

- simplifying Jelly view and submission handling