resolve symbolic links to the idp executable

when a symbolic link to idp is made in /usr/local/bin, idp doesn't run because it searches for the kbs executable in that directory.

ingmar@42 ~> idp
/usr/local/bin/idp: line 6: /usr/local/bin/kbs: No such file or directory

This can be resolved by replacing

DIR="$( cd -P "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

with

SOURCE="${BASH_SOURCE[0]}"
while [ -h "$SOURCE" ]; do # resolve $SOURCE until the file is no longer a symlink
  DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"
  SOURCE="$(readlink "$SOURCE")"
  [[ $SOURCE != /* ]] && SOURCE="$DIR/$SOURCE" # if $SOURCE was a relative symlink, we need to resolve it relative to the path where the symlink file was located
done
DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"

in the idp startup-script

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