Code review request (branch archefact-storedfunctions) about heurist HOT 6 CLOSED

Obsoleted LIMITED_LEVENSHTEIN() by modifying calling code.

The functions contained in this file have now been merged with 
addProceduresTriggers.sql
so new installations are automatically handled and may thus ignore 
addFunctions.sql

Existing installations must execute the following upgrade steps:
1) disable old UDFs from MySQL installation
   DROP FUNCTION LEVENSHTEIN;
   DROP FUNCTION LIMITED_LEVENSHTEIN;
   DROP FUNCTION LIPOSUCTION;
2) for each existing Heurist database, run
   USE dbname
   SOURCE addFunctions.sql

This completes the integration process of this branch.
Awaiting ok to merge now.

Ian suggests:
> How about we rename these procedures new_xxxx and update the code to
> call the new ones, then we don't have to remove the old UDFs so that
> our existing code continues to work [...]

NEW_ done.

Merged into archefact-all