RelativeLink.sh: cd to "$(dirname $0)" if it exists

This script relies on App et al existing in the CWD. Try to find out
where it is and cd to it.

This makes it possible to start the script via e.g. GNOME launchers,
which don't change the CWD.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>

RelativeLink.sh

@@ -14,6 +14,11 @@ if [ $1 ]; then
 	printf "\nDebug enabled.\n\n"
 fi
 
+# Try to be agnostic to where we're being started from, chdir to where
+# the script is.
+mydir="$(dirname $0)"
+test -d "$mydir" && cd "$mydir"
+
 # If ${PWD} results in a zero length HOME, we can try something else...
 if [ ! "${PWD}" ]; then
 	# "hacking around some braindamage"