Introduce case-specific run.sh scripts in deal.II tutorials

[MakisH]

Closes #826 by replacing the symlinks to run-dealii.sh with case-specific run.sh scripts that call that.

The case-specific scripts also implement the usual logging we have in other tutorials.

The GitHub interface shows the changes in a strange way. All symlinks have been replaced by a run.sh file with the following content:

#!/usr/bin/env bash
set -e -u

. ../../tools/log.sh
exec > >(tee --append "$LOGFILE") 2>&1

../../tools/run-dealii.sh "$@"

close_log

and I have checked locally that they run normally.