Added copy() method to Query.php and made NestedSet.php use it because native clone() does not work. Also Added ->getSql() to getRootAlias() so that _aliasMap is present after the parsing.

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added the fix for ticket #398. also fixed the missing $coll->setReference() in Doctrine_Relation_Association::fetchRelatedFor()

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Need to include float in the list for length checks. In general this default for length should be removed downstream in validator but to be consistent