DOC: comments in authtoken.example.yaml and renaming of a few variables

conf/core/authtoken.example.yaml

src/main/java/caosdb/server/accessControl/Config.java

...osdb/server/accessControl/OneTimeAuthenticationToken.java

src/main/java/caosdb/server/resource/ScriptingResource.java

...test/java/caosdb/server/authentication/AuthTokenTest.java