[Re-FIXED JENKINS-12457] 'Age' column on 'Test Result' tab may show incorrect value when a test suite divided into multiple junit files

Added testcase and changelog for JENKINS-13214. The actual fix is in 7fba6527

The trick for backward compatibility is in the default implementation
that grants View.READ to those who have access to items.

Use a ping timeout of 3/4 of the ping interval instead of the default
4 minute timeout.
This happens to workaround an issue in the remoting PingThread
implementation which causes the ping to busy wait for the timeout
period instead of keeping the channel alive.

icons after build completion.

Adjust z-index for #search-box-completion to appear over the breadcrumb

Applied the change from Olav Reinert.

Earlier Jenkins advertised being in port 80 regardless
what port it was really listening.

Also added registration to service _http._tcp which makes
Jenkins appear in Bonjour bookmarks of the Safari browser.

WorkspaceSnapshot now uses the tar.gz format to handle symlinks
correctly.

Tar/untar now correctly supports symlinks.

Fixed the file overwrite problem on Windows.