Conflicts:
	changelog.html

[FIXED JENKINS-23963] Use absolute sidepanel links for computers

[JENKINS-24244] If we are skipping polling due to quietingDown, at least record this fact in the system log.

Trying to make testRemoteKill less prone to random failure (presumably on a heavily loaded machine).

Missed this in previous commit - bad idea making even small changes late at night ;)

(cherry picked from commit 3daa6a97)

(cherry picked from commit 286337ea)

Adapted from #1375 by @daniel-beck: omitting change to User construction, and adding test.
(cherry picked from commit 088edabb)

Conflicts:
	changelog.html

Adapted from #1375 by @daniel-beck: omitting change to User construction, and adding test.

Missed this in previous commit - bad idea making even small changes late at night ;)

[FIXED JENKINS-24358] RunSaveableReference.get can acquire locks, so avoid calling it while holding a lock on ourselves.

Right now, checker is being attached to both onblur and onchange.  The result is when the user changes input, and that input loses focus, the checker is being fired twice.  This can cause issues on non-trivial field changes (such as validating a groovy script).  If there is no change, the checker is still called once due to the onblur.

The checker should only be called if the input is changed.

Added no-store to the Cache-Contorl header

Reference: http://stackoverflow.com/questions/866822/why-both-no-cache-and-no-store-should-be-used-in-http-response
Reference: http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.9.2