loadAllBuildHistory() fails to set the headers field on the replacement buildHistory DOM element.

The patch fixes the problem by recreating a headers field.
It also:
* slightly refactor the loadAllBuildHistory() method for readability
* add a FIXME note that the server side history widget should fail if the n parameter is missing.
* add a pre-condition check to the buildHistory() update to catch potential bugs (note that the logging is disabled as Yahoo.log doesn't appear available)

JENKINS-8658 depend on latest executable-war. This is where the fix should be. Note: of course one should release that dependency into a stable version

JENKINS-8658 let getHomeDir gather information about where it finds its location. Useful for troubleshooting.

ProxyOutputStream was not thread safe even though it often gets used by multiple threads, for example when you launch a remote process with the same stdout/stderr.

Add Spanish missing keys. Update Spanish internationalized values to have the word Jenkins instead of Hudson. Changes in translation tool to advise when a file have the Hudson word

Diverging from the normal RC process since the additional commits have
alrady been made in the master.

* rc:
  preparing for RC
  bug fix in the test
  Fixed a bug in the test harness.

... so as to follow the convention of keeping the master branch open for
commits.

* after-first-release:
  noting the changes
  Other languages on JVM may not be able to provide the type information.
  Added autocomplete feature to BuildTrigger

Fixed HUDSON-6689.  Updated the primary view name (default view) if someone changed the name of the view that was marked as primary.

and we have all the risks of angry users.

* commit '0ffa0327':
  Added autocomplete feature to BuildTrigger

According to  Juha Heimonen <heimojuh@gmail.com>, it's "a" with two dots
on top.