Intellij config: JDK setup: add missing interpolation marker in dev-tools/idea/.idea/misc.xml; dont print out follow-on instructions if ${idea.jdk} is defined; and when follow-on instructions are printed, show how to avoid the need to manually configure the JDK

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1524903 13f79535-47bb-0310-9956-ffa450edef68