Make bash script more robust

[muuki88]

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Use this bash guide to find possible bugs and make the bash script more robust.

#!/bin/bash
set -euo pipefail
IFS=$'\n\t'

[paddymahoney]

Just a request for a release note here when you implement these, we have some bashScriptExtraDefines that will most definitely fail with -e. :)

[muuki88]

At the moment I added set -e only to the debian controlscripts as lintian comlained. Hopefully I will find sometime to do this and I will make a big note when it's done :)