[jhc] darcs patch: remove most of PackedString.hs (and 4 more)

Sun Jan 29 05:34:31 PST 2012 John Meacham * remove most of PackedString.hs Sun Jan 29 06:45:24 PST 2012 John Meacham * add mtick', use it when stringtable overloaded enabled Sun Jan 29 07:49:25 PST 2012 John Meacham * move Module to containing an atom instead of a string Sun Jan 29 08:27:43 PST 2012 John Meacham * properly report ambiguity on re-defined top-level names Sun Jan 29 16:40:41 PST 2012 John Meacham * fix bug in const. primitive decoding