WIP: One-time token consumer and cronjob renewal

pom.xml

scripting/bin/administration/diagnostics.py

src/main/java/caosdb/server/CaosAuthenticator.java

src/main/java/caosdb/server/CaosDBServer.java

...java/caosdb/server/accessControl/AuthenticationUtils.java

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

...rver/accessControl/SelfValidatingAuthenticationToken.java

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

...n/java/caosdb/server/accessControl/SessionTokenRealm.java

.../caosdb/server/resource/AbstractCaosDBServerResource.java

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

src/main/java/caosdb/server/utils/ServerMessages.java

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