[FIXED JENKINS-20008] [FIXED JENKINS-18028] [FIXED JENKINS-18680] #1069: support for moving jobs into or out of folders.

[FIXED JENKINS-19826] element.setAttribute('name', …) does not work in IE in compatibility mode, so use prototype’s Element(…) which does.

[FIXED JENKINS-21254] Ensuring that all <link>s offered on the /login page can be read even by anonymous users without Jenkins.READ.

https://trello.com/c/MhG9Ksqa/12-windows-service-slave-launcher

[JENKINS-18410] NPE from previous fix (fcdf7499) under some conditions, which the test case was not exercising.
java.lang.NullPointerException
	at hudson.tasks.test.AggregatedTestResultPublisher$TestResultAction.getProject(AggregatedTestResultPublisher.java:173)
	at hudson.tasks.test.AggregatedTestResultPublisher$TestResultAction.<init>(AggregatedTestResultPublisher.java:146)
	at hudson.tasks.test.AggregatedTestResultPublisher$TestResultAction.<init>(AggregatedTestResultPublisher.java:135)
	at hudson.tasks.test.AggregatedTestResultPublisher.perform(AggregatedTestResultPublisher.java:90)

Noting yet another weird problem with BuildTrigger’s reliance on DependencyGraph for its own execution.
Since this is now (1.522) updated asynchronously, the value may not actually be correct, potentially causing erratic behavior especially in tests.

This change removes the superfluous UI elements around the error
message if possible. Otherwise, fall back to existing behavior
of adding entire page to iframe.

rebuildDependencyGraphAsync can wait a fraction of a second to improve the chances that events will be coalesced.

Make sure rebuildDependencyGraphAsync does not repeat work if called many times in quick succession.

(Turns out cloudbees-template at least needs this, and it is possible other things besides Trigger could use it too.)

JavaScript error when showing a FormException after Apply is clicked. Related to JENKINS-20772 but probably not the same.

[JENKINS-18678] Tweaking API, adding @since & changelog for #1075, fixing purgeCache so that test can pass.

This change resolve the issue with missing builds after the jobs renaming and further cleanup of cache.
Finally, the cache's directory location will be updated after the each job renaming.
https://issues.jenkins-ci.org/browse/JENKINS-18678Signed-off-by: NOleg Nenashev <nenashev@synopsys.com>

FileUtils.moveDirectory falls back to copy-and-delete if target does not yet exist, which fails to work correctly with symlinks.

[FIXED JENKINS-18680] Update members of a ListView using a regular listener, not View.onJobRenamed which does not work with folders.