Create setup.sh script and install in prefix (not compact directory)

We link the compact into the prefix of the detector, but it is easiest to just put the beamline setup.sh file in the compact directory. The structure is then, e.g.:

ecce.xml
setup.sh
compact/
  ecal.xml
ip6/
  setup.sh
  beamline.xml

templates/setup.sh.in

+#!/bin/sh
+
+export DETECTOR=@PROJECT_NAME@
+export DETECTOR_PATH=@CMAKE_INSTALL_PREFIX@/share/@PROJECT_NAME@
+export DETECTOR_CONFIG=@PROJECT_NAME@
+export DETECTOR_VERSION=@GIT_BRANCH@
+
+## note: we will phase out the JUGGLER_* flavor of variables in the future
+export JUGGLER_DETECTOR=$DETECTOR
+export JUGGLER_DETECTOR_CONFIG=$DETECTOR_CONFIG
+export JUGGLER_DETECTOR_VERSION=$DETECTOR_VERSION
+export JUGGLER_DETECTOR_PATH=$DETECTOR_PATH
+
+## Export detector libraries
+export LD_LIBRARY_PATH=@CMAKE_INSTALL_PREFIX@/lib${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}
+
+## Source beamline setup
+test -r $DETECTOR_PATH/ip6/setup.sh && source $DETECTOR_PATH/ip6/setup.sh