Bug 213671 Expose evaluate() method in IReportContext
Need Engine expose evaluate() method in IReportContext interface, this will be used to evaluate global Javascript expression in case there's no resultset bound to current report item.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/script/internal/ReportContextImpl.java
}
	public void deletePersistentGlobalVariable( String name )
	{
		context.unregisterGlobalBean( name );
	}
	public Object getPersistentGlobalVariable( String name )
	{
		return context.getGlobalBeans( ).get( name );
	}
	public void setRegisteredPersistantObjects( Map persistantMap )
	{
		context.registerBeans( persistantMap );
	}
	public Object getParameterValue( String name )
	{
		return context.getParameterValue( name );
	}
	public void setParameterValue( String name, Object value )
	{
		context.setParameterValue( name, value );
	}
	public Locale getLocale( )
	{
		return context.getLocale( );
	}
	
	public TimeZone getTimeZone( )
	{
		return context.getTimeZone( );
	}