[eve] Added check for easybuild modules.

scripts/env/eve/cli.sh

+if [ ! -f ~/.easybuild-yes ]; then
+    echo "ERROR: Easybuild modules not enabled but required!\n"
+    echo "Run 'touch ~/.easybuild-yes' and re-login to enable."
+    echo "For more details see:\n  https://www.opengeosys.org/docs/devguide/advanced/working-on-eve"
+    return 1
+fi
+
 module use /global/apps/modulefiles
 
 module load cmake