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.

Fix NPE in Launcher.decorateByPrefix

fix tabs

exposing the properties from the base class so that consumers can rely on them regardless of the actual subtype

fixes: JENKINS-12889 Jenkins "Workspace" presents "Run a build" even when Builds are Disabled

Add CANCEL permission that can be granted independently from BUILD perm.

add http header for under firewall enviroment and proxy to cache
Thanks

Conflicts:
	changelog.html

sample : using cloudbees folder plugin
JOB_NAME = foo/bar/job
BUILD-TAG = jenkins-job-number
this change make later to be jenkins-foo-bar-job-number

 Please enter the commit message for your changes. Lines starting

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

Tar/untar now correctly supports symlinks.

Fixed the file overwrite problem on Windows.