Tuple library added to CVS tree

From: jaakko.jarvi_at_[hidden]
Date: 2001-08-10 07:03:50

Hi, 

All suggestions/comments/etc. received during the tuple review period
have been carefully considred and some changes to the library 
resulted. 

Most notably:

- tuples are now directly under boost namespace
  (some name changes resulted because of this)
- indexing went from 1-based to 0-based (and the 'name like'
  constants were not defined after all (see rationale in
  documentation)
- nil is now null_type
- previously undocumented features (like some type functions)
  are now documented.

Thanks again for all the feedback.

Jaakko