fix bug preventing the use of key@/ (which is not intended to be used with fcpupload, though).

--HG--
extra : source : 5425df9708b0e0081297902b401f9f8de6036293
fixed the help text: DDA needs the absolute pathname to be the same for node and script.
removed debugging output.
fix typo
print help in a single print command (minimally invasive version).
FIX: fcpupload file — this and the previous few changes are thanks to the code review from operhiem1/Steve

--HG--
extra : amend_source : d5a0c450cb7c5fb890b4ec56dec13c3762109861
todo: switch to argparse.
give node.put() the required information to use DDA, even if TestDDARequest failed - put is more intelligent than fcpupload and just uses contenthash.
fixed deprecated comment
added fixmes.
merge master into files-in-manifest.