fix external script for filenames with spaces from protocol

Fix the external special remotes git-annex-remote-ipfs,
git-annex-remote-torrent and the example.sh template to correctly support
filenames with spaces.

This commit was sponsored by John Peloquin on Patreon.

doc/special_remotes/external/git-annex-remote-ipfs

@@ -81,9 +81,11 @@ while read line; do
 			echo CHECKURL-CONTENTS UNKNOWN "$(urltoaddress "$url")"
 		;;
 		TRANSFER)
+			op="$2"
 			key="$3"
-			file="$4"
-			case "$2" in
+			shift 3
+			file="$@"
+			case "$op" in
 				STORE)
 					addr=$(ipfs add -q "$file" </dev/null) || true
 					if [ -z "$addr" ]; then