Checked and fixed possible quoting problems using shellcheck. #58
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There are still a number of open warnings reported by shellcheck but
they are not as easy to fix as quoting.
This PR is not really tested and I am not 100 % sure that I did not
introduce bugs by this rework. Unfortunately I did not find a tool to do
this quite monoton task for me.
Related to
#57 (comment)
@drybjed Looking throught the scripts it seems that there was a but much copy paste involved. I guess we should refactor that?