Ada: look for config file in ada script dir

[onnozweers]

Raymond launched the idea to distribute Ada via CVMFS. You would then also want to distribute configuration file ada.conf the same way. A problem would then be, that Ada only looks for at /etc/ada.conf and ~/.ada/ada.conf. These are not and cannot be distributed via CVMFS.

Solution: tell Ada to look for an ada.conf in the same dir as where the script is. Something along these lines:

SCRIPT_DIR="$( dirname "${BASH_SOURCE[0]}" )"
source "$SCRIPT_DIR/ada.conf"