Bugfixes

acdhOeaw\arche\lib\Repo::getResourcesBy*() and acdhOeaw\arche\lib\RepoDb::getResourcesBy*() finally honor the acdhOeaw\arche\lib\SearchConfig::$orderBy. Previously the $orderBy property has been used only to properly filter resources according to acdhOeaw\arche\lib\SearchConfig::$offset and acdhOeaw\arche\lib\SearchConfig::$limit. Now the order applies also to the values of the iterator returned by getResourcesBy*() methods.