Update script.sh: Add set -euxv

[bernhardkaindl]

closes #114

[bernhardkaindl]

I haven't tested it yet, and it might abort early, but I wanted to submit this standard solution.

The set -euxv is the standard that I put in every script:

• As the -u causes an error (and with -e an exit) on any unset variable, you may either omit the --u flag, or instead set empty default values for variables which might not be set (which would be better). The benefit of -u is in the latte way is that whenever there is a variable name issue (usually a typo or somehow a missing input) the script aborts at the location of the unset variable access.

[tsuyoshicho]

Close #115

Additional corrections will be made in the next PR.