Add file name here too - since some log messages will not add it and leave the user in the dark.

Also add the hint that we don't support APP-relative paths anymore.

js/server/modules/org/arangodb/foxx/service.js

@@ -366,6 +366,7 @@ class FoxxService {
       return module.exports;
     } catch(e) {
       if (e instanceof ArangoError) {
+        e.errorMessage += "\n(app relative include paths not supported anymore) \nFile: " + filename;
         throw e;
       }
       var err = new ArangoError({