reject batch options combined with non-batch options

Reject combinations of --batch (or --batch-keys) with options like --all or
--key or with filenames.

Most commands ignored the non-batch items when batch mode was enabled.

For some reason, addurl and dropkey both processed first the specified
non-batch items, followed by entering batch mode. Changed them to also
error out, for consistency.

Sponsored-by: Dartmouth College's Datalad project

Command/Add.hs

@@ -95,7 +95,8 @@ seek o = startConcurrency commandStages $ do
 		Batch fmt
 			| updateOnly o ->
 				giveup "--update --batch is not supported"
-			| otherwise -> batchFiles fmt gofile
+			| otherwise -> batchOnly Nothing (addThese o) $
+				batchFiles fmt gofile
 		NoBatch -> do
 			-- Avoid git ls-files complaining about files that
 			-- are not known to git yet, since this will add