Item9808: truncate long data to fit into finite fields. The tradeoff is between being able index fields for searching, or use them to store full data at the expense of the indexes. Searching TEXT is fast in MySql and Postgresql, but a disaster in SQL server.

git-svn-id: http://svn.foswiki.org/trunk/DBIStoreContrib@17304 0b4bb1d4-4e5a-0410-9cc4-b2b747904278