Scripts to paperbackup arbitrary input data with symmetric encryption#8

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fedorkotov wants to merge 8 commits intointra2net:masterfrom

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Commits on Jun 30, 2018

Added script to do symmetric encryption and base64 encoding on input files before passing them to papaerbackup. And another script to decode and decrypt resulting backups.
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Commits on Jul 8, 2018

Changed default encryption tool to gpg2 with fallback to gpg if gpg2 is unavailable
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Added cipher selection option for gpg-paperbackup.sh
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Now gpg-paperbackup.sh paperrestore-gpg.sh scripts fail if gpg fails for some reason (missing input file, etc.)
fedorkotov
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Changed shebang in gpg-paperbackup.sh and paperrestore-gpg.sh to more portable one. Restored intra2net's shebang in paperbackup-verify.sh
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Renamed scripts for symmetric encryption of files before backup
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Updated comments in paperbackup-symmetric.sh and paperbackup-symmetric.sh
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paperbackup-symmetric.sh can now read input data from stdin and paperrestore-symmetric.sh can write output data to stdout
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