(sql-sybase-options): New option.

(sql-sybase-options): New option.
(sql-sybase): Use it.  Add sql-database to the list of parameters
provided for login.  The options -w 2048 -n are not used any more.
(sql-postgres-options): Changed default from "--pset" to "-P".
(sql-mysql-options): Doc change.
(sql-stop): Doc change.