RFR 8150681 Update JAR specification for multi-release jar files

[Paul Sandoz]

Hi,

Please review an update to the JAR “specification” (in the loose sense of the term):

- first, it has been moved from a closed repository into the idk repository (same shared location as the recently introduced serialisation specification) and converted to markdown:

  http://cr.openjdk.java.net/~psandoz/jdk9/JDK-8150681-jar-spec-markdown/webrev/ <http://cr.openjdk.java.net/~psandoz/jdk9/JDK-8150681-jar-spec-markdown/webrev/>

(This also includes a new attribute Launcher-Agent-Class, a Jigsaw related change to better support Java agents.)

For comparison, the HTML version online is here:

  http://download.java.net/java/jdk9/docs/technotes/guides/jar/jar.html <http://download.java.net/java/jdk9/docs/technotes/guides/jar/jar.html>

- second i have added sections on multi-release JAR files:

  http://cr.openjdk.java.net/~psandoz/jdk9/JDK-8150681-jar-spec-markdown-with-mr-jar/webrev/ <http://cr.openjdk.java.net/~psandoz/jdk9/JDK-8150681-jar-spec-markdown-with-mr-jar/webrev/>

this is based against the first patch so the changes can be easily viewed.


I expect some further editing of this specification to add further links to module related stuff and tidy up existing links to tools etc.

Thanks,
Paul.