Revert "Merge pull request #3"

This reverts commit e09ebd0c05dee07f683cdbfcea47fb1c47b904c6, reversing
changes made to 492dca1da1842c0bd5f7e6ef9d75033a4a43b3eb.

Made plugin code more complex, and made plugin-compat-tester fail,
when the baseline was already pretty old (1.509.x).
Does not feel worth the hassle.
[JENKINS-25524] Making sure that the correct overload of PrintWriter.print is whitelisted by default for use from Groovy templates.
[JENKINS-25524] There are cases where Groovy picks one of two incomparable overloads even where javac would report an error; they must be allowed.
[maven-release-plugin] prepare release script-security-1.10