debbisect: fix critical problems

Johannes Schauer Marin Rodriguesrequested to merge
(removed):debbisect into master
  • install run_bisect and run_bisect_qemu into the script subdirectory
  • use os.path.lexist instead of os.path.exist when checking symlinks
  • set the PATH environment variable to a sensible default if it's not set
  • automatically retry a download aborted by snapshot.d.o after 10 seconds
  • instead of appending, seek to the correct position in the output file

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