[JENKINS-9301] don't recalculate dependency graph if modules haven't changed

Minor optimization for MavenFingerprinter + unit test for fingerprinter

- remove usage of JVM-internal InternalError

before letting the writer loose.

Used to be in maven-hpi-plugin for annotation processing. Rewritten with JSR-269 and now it should be a part of core.

Use parent ItemGroup not Jenkins in constructor of MavenModuleSet

restart

projects.

I'd like to believe that the original reason was because earlier
versions of XStream that we used early on didn't support the methods
that take InputStream as a parameter.

Restart button that appears under list of installed plugins after plugin
upload does not restart jenkins when clicked.

More than that, after turning on/off some of installed plugins,
two restart buttons appear (only one of them work) on the page in
question.

Such behaviour should definitely be fixed.

added CodeMirror to enable syntax highlighting. Inspired by https://github.com/jenkinsci/groovy-postbuild-plugin/pull/1

See http://stackoverflow.com/questions/4845762/onload-handler-for-script-tag-in-internet-explorer

This reverts commit a859d2e9.
I pushed relevant jars yesterday but doesn't look like they hit central
yet.

session cookie name.

Integrating a newer version of libaries that have the correct license
header in POM and source code.