Fix index generation bug that oocasionally prevented messages from

appearing in index.  pipermail generated several indexes by assuming
that date was unique.  If two messages arrived with, e.g., the same
author and date, then the author index treated them as identical.
As a result, both messages were archived, but only the last one was
included in the index.  Solution is to always include the msgid, which
is unique, in the index key.

Change database keys to combine elements using tuples instead of
string concatenation with \000 as separator.

Fix was accomplished by refactoring on pipermail.Database and its
subclasses.  Push index-key generation into common concrete base class
Database; rename abstract base class to DatabaseInterface.  Break up
addArticle method into several pieces.

TBD There is still more refactoring to do on Database class.

Because date key has changed, HyperDatabase method to return first and
last date changed to reflect format of date key.

Refactor pipermail.T.add_article into several pieces.

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