Make-dao: initiates a DAO object basing on alist of (slot-name . slot-value) pairs.

Query-dao: allows making dao's from arbitrary (s-)sql.

Select-sql has been rewritten to use QUERY-DAO, which makes it more efficient.
Tests included.

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Error in UNRELATEDP definition in macro DEF-MANY-TO-MANY corrected.

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Problem: save-dao on a dao containing references to unsaved objects
would raise an error (revealed by new save-dao tests).

Fixed by editing slot-value-or-id-if-foreign to save any unsaved
daos. slot-value-or-id-if-foreign has also been moved to dao.lisp.

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Functions refering to non-transient slots now also reject slots whose allocation is :CLASS.

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