Sat Dec 25 10:04:32 1999  Zoran Constantinescu <zoran@idi.ntnu.no>
	* htlib/Database.h: Class Database is inherited from X_db too.

	* htlib/X_db.h: Generic functions for SQL. Added to class Database
	to make as small changes to the code as possible.

	* htlib/Database.cc: Choose database type from config file! Changed 
	getDatabaseInstance to use config["db_type"].

	* htlib/SQL_db.cc,h: Added code for generic SQL databases.

	* htlib/MySQL_db.cc,h: Added code for MySQL databases.

	* htlib/HashWord.h: Experimental code for buffering the words from
	database in memory (for database speed-ul). Need to be completed.

	* htcommon/DocumentRef.h: Added new ReferenceStates and the server
	where the document is (docServerID) and its type (docServerType).

	* htcommon/DocumentDB.cc,h: Added the external 'config' variable. 
        The Add() function is changed to call SQL_db::AddDocInfo(). Added 
	operator[](int) to get documents from database by ID. Modified 
	code for SQL in CreateSearchDB() and URLs() (do nothing if SQL!?). 

	* htcommon/defaults.cc: added default values for config parameters: 
	db_type - database type: (DB2), GDBM, MySQL (! any SQL type database
	should contain the "SQL" letters!),
	SQL_debug - debug level for logging SQL messages (default 0),
	SQL_log_file - log file for SQL messages,
	SQL_dbase - connection information for SQL servs "user:pswd@host:dbase"

	* htcommon/WordList.cc: Flush() changed to write link informations 
	to the SQL database (if SQL).

	* htfuzzy/Fuzzy.h: Added new getWords(...+wordIDs) function which 
	returns also a list of the wordsIDs (if we are SQL, we use IDs 
	much more).

	* htfuzzy/Synonym.cc,h: Added code for the new getWords() function.

	* htfuzzy/Endings.cc,h: Added code for the new getWords() function.
 
	* htfuzzy/EndingsDB.cc: Changed code to use SQL databases if necessary.
	The createRoot() function uses SQL.

	* htlib/Makefile.in: Added SQL_db.o MySQL_db.o to the list of
	objects.

	* htdig/htdig.cc: If SQL, no need to add the list to retriever. 
	Added options '-x start_url' and '-z limit_urls_to'.

	* htdig/Document.cc,h: Added server_type (what kind of web server).

	* htdig/Retriever.cc,h: Added SQL support for links. Each link
	found in documents will be added to the database.

	* htsearch/htsearch.cc: Added SQL support. And add the search to 
	the database.

	* htsearch/WeightWord.h: Added word_id;

	* htsearch/ResultMatch.h: Added id and functions setDocID(), getDocID().

	* htsearch/Display.cc: Added SQL support. To be checked!