`soffice` command results in an error if the filename contains special characters.

[jonathandixon]

When running Hydra::Derivatives::DocumentDerivatives with a file name that includes parenthesis soffice exits with an error.

Unable to execute command "soffice --invisible --headless --convert-to pdf --outdir /tmp /tmp/file(1).pptx".
Exit code: pid 18230 exit 2 Error message: sh: 1: Syntax error: "(" unexpected

[jonathandixon]

I wonder if this is as simple as quoting #{path} on this line

execute "#{Hydra::Derivatives.libreoffice_path} --invisible --headless --convert-to #{format} --outdir #{outdir} \"#{path}\""

I'm not sure it this will have unwanted consequences. Should there also be a check to determine if the path is already quoted?

[mjgiarlo]

@jonathandixon I wonder if we should run the path through a method like https://ruby-doc.org/stdlib-2.3.0/libdoc/shellwords/rdoc/Shellwords.html#method-c-shellescape

[cjcolvar]

Fixed by #164.