[FIXED JENKINS-21855] Add preview for parameter descriptions

[FIXED JENKINS-21958] FilePath.copyRecursiveTo given a scanner including a symlink but not any regular file in the same directory would neglect to create the parent directory on the destination and thus not copy the link.
(Util.createSymlink is partly to blame for not throwing a descriptive IOException when it fails to create a link,
but this is its historical behavior needed for compatibility.
copyRecursiveTo also continues to suppress error text from this method because there is nowhere for it to go.
Perhaps need a new variant of createSymlink that is guaranteed to either have created the link or throw an exception.)

Seems to work in 8.0 at least for some functional tests.
Developers can always disable it privately if they run into issues.

fixed i18n issue for Chinese(zh_CN): remove 查克·诺里斯说

fixed i18n issue for Chinese(zh_CN): remove 查克·诺里斯说 ( "\u67E5\u514B\u00B7\u8BFA\u91CC\u65AF\u8BF4\uFF1A" )  from *.zh_CN.properties

merge from jenkins trunk

... based on Tyler's discovery at https://gist.github.com/rtyler/9195510

testRemoting(hudson.util.ProcessTreeTest)  Time elapsed: 0.097 sec  <<< ERROR!
java.util.NoSuchElementException: null
        at java.util.HashMap$HashIterator.nextEntry(HashMap.java:897)
        at java.util.HashMap$ValueIterator.next(HashMap.java:922)
        at hudson.util.ProcessTreeTest$MyCallable.call(ProcessTreeTest.java:42)
        at hudson.util.ProcessTreeTest$MyCallable.call(ProcessTreeTest.java:38)
        at hudson.remoting.UserRequest.perform(UserRequest.java:118)
        at hudson.remoting.UserRequest.perform(UserRequest.java:48)
        at hudson.remoting.Request$2.run(Request.java:328)
        at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
        at java.util.concurrent.FutureTask.run(FutureTask.java:166)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:724)

He runs this on FreeBSD.

Add alternative field calls for deprecated methods.

[FIXED JENKINS-16332] Ensure that User records are saved when the fullName is not recoverable from the id.
Otherwise User.get(id).getFullName() after restarting Jenkins will produce the wrong result.

For example https://jenkins.ci.cloudbees.com/job/core/job/jenkins-core-validated-merge/38/testReport/lib.layout/LayoutTest/rejectedLinks/ failed with:
java.io.IOException: GET http://localhost:52099/jenkins/login failed
	at java.net.SocketInputStream.socketRead0(Native Method)
	at java.net.SocketInputStream.read(SocketInputStream.java:152)
	at java.net.SocketInputStream.read(SocketInputStream.java:122)
	at java.io.BufferedInputStream.fill(BufferedInputStream.java:235)
	at java.io.BufferedInputStream.read(BufferedInputStream.java:254)
	at org.apache.commons.httpclient.HttpParser.readRawLine(HttpParser.java:78)
	at org.apache.commons.httpclient.HttpParser.readLine(HttpParser.java:106)
	at org.apache.commons.httpclient.HttpConnection.readLine(HttpConnection.java:1116)
	at org.apache.commons.httpclient.MultiThreadedHttpConnectionManager$HttpConnectionAdapter.readLine(MultiThreadedHttpConnectionManager.java:1413)
	at org.apache.commons.httpclient.HttpMethodBase.readStatusLine(HttpMethodBase.java:1973)
	at org.apache.commons.httpclient.HttpMethodBase.readResponse(HttpMethodBase.java:1735)
	at org.apache.commons.httpclient.HttpMethodBase.execute(HttpMethodBase.java:1098)
	at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:398)
	at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
	at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
	at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:346)
	at com.gargoylesoftware.htmlunit.HttpWebConnection.getResponse(HttpWebConnection.java:101)
	at com.gargoylesoftware.htmlunit.WebClient.loadWebResponseFromWebConnection(WebClient.java:1456)
	at com.gargoylesoftware.htmlunit.WebClient.loadWebResponse(WebClient.java:1387)
	at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:328)
	at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:389)
	at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:374)
	at org.jvnet.hudson.test.JenkinsRule$WebClient.goTo(JenkinsRule.java:1944)
	at org.jvnet.hudson.test.JenkinsRule$WebClient.goTo(JenkinsRule.java:1926)
	at lib.layout.LayoutTest.rejectedLinks(LayoutTest.java:44)
which makes little sense since the named IOException is actually thrown from HttpWebConnection.java:130.
Perhaps Surefire is not reporting the original cause correctly, conflating the wrapper’s message with the original stack trace.
As a temporary measure, printing the original stack trace to stderr if there is any.

Deprecate the static final variables used in IOUtils.

Wait one second before writing to log files. Switched to while loop to
prevent extra one second delay.

[FIXED JENKINS-12124] Occasionally errors loading plugin classes since it is expected that findClass (and findLoadedClass) are called under synchronization.
The problem was masked by a blind assumption that an InvocationTargetException was in fact wrapping a ClassNotFoundException.
Many thanks to @gotwarlost for demonstrating how to reproduce the problem and diagnosing the cause.

Upgrade to commons-io 2.4

In order to maintain backwards compatibility we need to keep IOUtils the
same as in commons-io 1.4. This code is backwards compatible, however
most of the methods have been deprecated and should instead use the
org.apache.commons.io.IOUtils version instead.

Javadoc for Queue.Task claimed they were compared using .equals(), but in critical cases this was not actually true.
Does not matter for the common case of Job, but when implementing custom tasks this could cause duplicate queue items (and executables).

[FIXED JENKINS-21159] Merged #663.

JENKINS-20618 diagnostics (also in 1.532.2) are on top of jzlib 1.1.3.

also made its display name localizable

Senseless for the state field to be protected when the enum used for its type is private: no subtype could use it anyway.