ACtl.closeTab
			
			
	 Closes one or more tabs and windows.
				
	
		ACtl.closeTab([tabSpec])						tabSpec Type: TabSpec  Default: undefined 
		One or more tabs to close. It can be either a tab ID, a filter object, a tab-selection name or an array combining all that. Full details at Tab Specifier. 
 If omitted, the tab the script is running in will be closed.
			Returns Type: Promise  Resolves to: number 
		Returns immediately. The Promise will resolve with the number of tabs that were closed, which may be zero if tabSpec gives an empty set.
			Throws Type: string 
		Error description if tabSpec is not a valid Tab Specifier.
		
	Examples
	Close all tabs to the right of the current tab.
	
	let tabCount = await ACtl.closeTab('#allRightTabs') ;
	
	
	Close the current window.
	
	let tabCount = await ACtl.closeTab('#currWinTabs') ;
	
	
	
	Open a URL in a pop-up window, then wait 2 seconds and close the window.
	
	let [tabId] = await ACtl.openURL('http://example.com', {newWindow: 'popup'}) ;
	await ACtl.sleep(2000) ;
	ACtl.closeTab(tabId) ;