[FIXED JENKINS-17025] NPE when checking if the executor is interrupted

29426012 introduced an NPE.
If a project implements Queue.FlyweightTask, build.getExecutor() returns null.
This prevents any flyweight build from finishing successfully.

[JENKINS-17016] Fix Spanish translations
Thanks

Correct Spanish grammar and orthography in various Spanish translation
files.

The compiler used to compile src/test/java/**/*.groovy seems to produce
a reference to org.codehaus.groovy.transform.powerassert.ValueRecorder,
while our Groovy runtime appears to contain
org.codehaus.groovy.runtime.powerassert.ValueRecorder.

I suppose the proper fix is to somehow run Groovy 1.8 compiler,
but this fix adds the necessary code to the classpath.

Added backward compatible data loader and a corresponding test case.

HyperlinkNote shouldn't emit the absolute URL.

This change is originally from pull request #682.

For a reason similar to ded37a2b,
better to run with non empty context path.

This helps us catch a typical error of not using ${rootURL} or
getContextPath() where needed.

[JENKINS-15156] Missing call to onCreatedFromScratch caused failures in MatrixProjectTest (when run from Surefire at least).

d62e95a9.

b5ed3199 already caught linkage errors but then unconditionally returned false from Util.isSymlink, which is wrong;
we want to fall back to the generic File.canonicalPath comparisons in this case.

Add run display name as an environment variable when RunParameter is used as a parameter.

Url with contextPath for non-standalone installs.

Conflicts:
	core/src/test/java/hudson/UtilTest.java