I've just uploaded this release to

  http://www.pogner.demon.co.uk/components/bc/

Changes:

  Added Unbounded Collections and Unbounded Ordered Collections.

  BC.Support.Bounded, BC.Support.Unbounded subprogram specs were
  confused about whether indexing was from 0 (as in the C++) or 1 (in
  the Ada). BC.Support.Unbounded.Append(2) had an error when appending
  after the first element.

  Corrected a misuse of a GNAT compiler "feature" (A procedure and a
  protected type entry in the same scope had the same name; you can't
  rely on the fact that only entries can have 'Caller applied to resolve
  these names).

  Added ObjectAda-special versions of the Bag test driver.