This routine closes an open connection to the database.  The memory
	associated with the connection is released.

	db_handle	pointer to a database handle
			(This is a structure of type db_handle_t.)

	This function requires the following include files:

	clib_h, cns_data_structs_h, acnet_errors_h

	Related functions:

	db_select, db_modify, db_open, db_error, db_nextrow

	C/C++ usage:

	usage example