use the new "read" function of Index to achieve this, wasn't too 
  easy to test
* add an "auto" value as compression choice to File to simplify index
  code, for the above fix

a detailed explanation (and comment) about this but for now please
test it...

releaseFrom/To, Conflict, permanent

  to copy local files to File.download for that
* remove redundancy with filename check
* fix: move index back into place when no repo ID is given to read_uri

* fix: stderr wants PIPE to connect to process
* remove psyclo support, might not be too useful for cli 
which is usually one shot

  as requested by AEK