Create a database table with parsed raw data.

Create a database table with parsed raw data.

Incoming data is written to DBTableRaw without
much interpretation. To allow for more and
better analysis that raw data should be parsed
daily and copied to another database table
with separate fields for most header lines.
All other scripts could use that pre-parsed
data.

* Add database schema to install.pl
* Add DBTableParse to newsstats.conf.sample
  and as mandatory to NewsStats.pm
* Add parsedb.pl

TODO:
- Documentation is only rudimentary.
- From:, Sender:, Reply-To: and Subject:
  are not yet parsed.
- gatherstats.pl does not yet use DbTableParse.

Signed-off-by: Thomas Hochstein <thh@inter.net>