change working directory in development scripts to allow running from other directories

dev/dbus-start.sh

@@ -1 +1,3 @@
+cd "$(dirname "$0")"
+
 DBUS_VERBOSE=1 sudo dbus-daemon --config-file=dbusconf.conf --nofork

dev/gui-start.sh

@@ -1 +1,3 @@
+cd "$(dirname "$0")"
+
 DBUS_SYSTEM_BUS_ADDRESS='unix:path=/tmp/tuxclocker-dbus-socket' ../inst/bin/tuxclocker-qt

dev/tuxclockerd-start.sh

@@ -1 +1,3 @@
+cd "$(dirname "$0")"
+
 DBUS_SYSTEM_BUS_ADDRESS=unix:path=/tmp/tuxclocker-dbus-socket sudo -E LD_LIBRARY_PATH=../inst/lib ../inst/bin/tuxclockerd