Added test case 120, ftp with '-Q -'

tests/data/Makefile.am

@@ -54,4 +54,5 @@ command9.txt      name15.txt        prot6.txt \
 error111.txt      name16.txt        prot7.txt \
 command26.txt  prot26.txt     command27.txt  prot27.txt \
 name26.txt     reply26.txt    name27.txt     stdout27.txt \
-command28.txt  name28.txt     prot28.txt     reply28.txt
\ No newline at end of file
+command28.txt  name28.txt     prot28.txt     reply28.txt \
+command120.txt  name120.txt     prot120.txt     reply120.txt

tests/data/command120.txt

+ftp://%HOSTIP:%FTPPORT/106 -Q "-DELE file"
+
+

tests/data/name120.txt

+ftp download with post-quote delete operation

tests/data/prot120.txt

+USER anonymous
+PASS curl_by_daniel@haxx.se
+PASV
+TYPE I
+RETR 106
+DELE file

tests/data/reply120.txt

+data
+    to
+      see
+that FTP
+works
+  so does it?