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Properly handle a ViewGroup other than Jenkins itself, such as a folder.

[FIXED JENKINS-19920] Using selfReference to mean “none” from nextBuild/previousBuild was just asking for trouble.
JENKINS-16194 and an analogous but opposite bug fixed more simply by introducing a separate NONE constant.
Also numberOnDisk did not get updated properly after a build was deleted, causing double loading of build records in some cases.

Conflicts:
	maven-plugin/pom.xml
	plugins/pom.xml
	ui-samples-plugin/pom.xml

This reverts commit d15c1550.

Consult Descriptor.newInstance() even when proccessing is in the middle
of JSON tree.

Conflicts:
    core/src/main/resources/hudson/views/BuildButtonColumn/column.jelly

ClassicPluginStrategy.DETACHED_LIST could confuse ClassicPluginStrategyTest by injecting dependencies on split plugins that have an index.jelly.

Superfluous in that if you *want* to look at UI samples, you can just install that plugin.
And observed to cause a cyclic plugin dependency error when splitting matrix-auth from core.
(Unclear why ui-samples had a dependency on matrix-auth; perhaps related to dependency from test module.)

Fix `mvn -Plight-test install` on Ubuntu 13.04 with OpenJDK

Shaves >11min off the test time for maven-plugin on my machine!

Migrated some usages of GNUCLibrary to the jnr PosixAPI, fixed 'mvn -Plight-test install' on ubuntu with OpenJDK.