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The primary goal of this branch was to fix the sort bugs in AssetAdmin, however, it started a bit of a yak shave in that the API around SQLQuery was poor. The biggest change that this pull request makes is it changes the format of SQLQuery::$select to contain aliases as array keys (and consistently puts the "implicit alias" in there to assist with various query generation logic), but it also makes a bunch of changes to avoid direct access of that property.
This allows DataList::create('SiteTree') as equivalent to Object::create('DataList', 'SiteTree'), without
having to have a create() function on DataList. Required for E_STRICT compliance.