Review request for 8022483: Nashorn compatibility issues in jhat's OQL feature

[A. Sundararajan]

Please review http://cr.openjdk.java.net/~sundar/8022483/

* JSAdapter change: __call__ for method calls in Nashorn
* No __proto__ assignment support in Nashorn - changed to copy functions 
from proto
* Wrapperless Java object access in Nashorn. instanceof java.lang.Object 
to check for Java objects is wrong in nashorn.
Checking for 'script object' by Object.getPrototypeOf call.
* Made documentation current and checked all example queries (manually) 
against a sample heap dump.

Thanks
-Sundar