No il8n, static fatal error handler, bug fixes

Removed dependence on new internationalization library.
Made fatal error handler static because v8 out of memory errors can occur even during constructor
execution.
Quietened down buildv8.bat and removed setting of environment variables that was left over from the previous v8 build system: scons.
Brought up to date with v8 3.27 branch.
Fix re-entrancy problem: nested JavascriptScope objects (e.g. when invoking Run on a context form within JavaScript code already running on the same context) failed to properly clean up the thread-static sContext
reference, leading to a memory leak.