native cmds and libs in the module library

[Chris Hegarty]

Here is an updated webrev based on the comments and feedback I received 
on this.

  - An additional option is added for supporting config files
  - jdk/jre images are created by installing jmod files ( if available )
  - Some code cleanup and style changes

http://cr.openjdk.java.net/~chegar/jigsaw/libbin_webrev.03/webrev/

Issues I intend to address separately:

  - Separate out native libs and config files during the build, so they
    can be put into the right sections of the jmod file
  - Investigate the potential for global configuration files versus
    non-editable per-module config files.

Thanks,
-Chris.