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require_once the auth libs, they may be required by lib/errors.php if an error message needs to go to the screen and the session object is required

Tell the user they cannot use the networking support if they have not installed the appropriate PHP modules

horrible workaround for mysql- you cannot insert id = 0 into usr at core data install time, which breaks things that rely on the root user (eg templates with no owner)

xmldb: mysql generator now allows itself create foreign keys and adds type=innodb in the extra table sql

added support in xmldb wrapper to ask the generators for extra table sql after the closing brace, so that mysql can, for example, specify TYPE=

Use styles for expanding icons. This makes the stylesheet a lot smaller. Removed the old icons no longer needed.