Review request for JMC-3338: Visualization of loaded libraries.

[Marcus Hirt]

Hi all,

Please review this fix to add simple visualization of loaded native libraries.

Also fixes some other annoyances:
. Environment variables should be sorted on key by default.
. System properties should be sorted on key by default.
. It should be okay to have a query with both attributes and aggregators to
fuel 
  the DistinctItemsPage.
. Some unused imports.

Jira:   https://bugs.openjdk.java.net/browse/JMC-3338
Webrev: http://cr.openjdk.java.net/~hirt/JMC-3338/webrev.0/

Kind regards,
Marcus