Added site variables ('sitevars').
These are stored in the sitevariables database table. Each one has a name, a description (NOT OPTIONAL!), a default value, and a current value. If the current value is NULL, the default value is used. Soon, a mechanism will be added to the install process to ensure all needed site variables exist before installing; more on that when it is committed. - Added 'editsitevars.php3' page, accessable to admins via the 'Edit Site Variables' menu option. - Added 'setsitevar' script, an interface for listing, viewing in detail, and setting site variables. - Web interface now uses 'web/nologins' and 'web/message' instead of one-off database tables. NOTE that setting a variable to the default value and setting a variable to a value which is string-identical are NOT the same thing. (This doesn't matter yet, but when we push default values out to remote sites as part of our install, it will.)
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