DynamicList
-----------
  - construction, assignment and append

HashSet
-------
  - construction, insert, set.
  - assignment will use the implicit List constructor

hashedWordList
--------------
  - construction, assignment
  - additional sort() and uniq() methods.
  - Readonly access to HashTable information via lookup() method.
  - NB: could avoid 'const char**' constructors in the future