[stringtemplate-interest] auto-flattening lists

[Terence Parr]

Hi, added a bug

http://www.antlr.org:8888/browse/ST-29

mentioned by John Synders at

http://hardlikesoftware.com/weblog/2007/06/01/thoughts-on- 
stringtemplate-part-1/

I note in my code this for setAttribute:

	 *  If you send in a List plus other values to the same
	 *  attribute, they all get flattened into one List of values.
	 *  This will be a new list object so that incoming objects are
	 *  not altered.

What is correct functionality?  If you send in a list of names and  
then "Ter", should it add "Ter" to the list or should the attribute  
be a 2-element list with a list as first element and string as 2nd?

Ter