History
-----------------

31 December 2000: 1.7
	* A bug in tree optimization routine has been fixed.

25 October 2000: 1.6
	* Fixed major bugs while editing, renaming and deleting symlinks.

13    July 2000: 1.5
        * Added $path_base parameter to config.inc, which configures
	  arbitrary base for path and link field in categories table.
	* Added javascript confirmation dialog when deleting tree parts.
	  Thank to Ramil for helping with this.

06    July 2000: 1.4
        * $DEBUG configuration parameter added to config.inc. If set to 1,
	  then all queries passed to SQL-backend are echoed.
	* Added create script for PostgreSQL and fixed some Postgres issues.
	  Thanx to Alex Barkov for helping with this.

05    July 2000: 1.3
        * Oracle strange bug workaround when empty strings treated as NULL.
	  Many thanx to Igor Suhih for help in fixing that.
	* Added create scripts for mysql and oracle backends
	* Config part of script moved to config.inc module
	* Changes in tree deletion routines. Now your current path in tree
	  does not changes after delete.

02    July 2000: 1.2
        * Added $fill configuration parameter. It specifies tree
        filling strategy:
            0 - new records always inserted at the end of tree (old behavior)
            1 - new records inserted in first empty slot (new optimal strategy) 

01    July 2000: 1.1
	* Oracle 7 and 8 support added. (Using SQ_caregories_id sequence).

10    June 2000: 1.0

	* First public release