add makros to create an instance of a class on the stack (ment for global constant instances that never change, eg. defined NULL values)
add zero uuid instance
some more stuff in rbac files...still nothing really useful, but finally I have more or less an idea how to implement it
remove unnecessary stuff in user declaration
test code for zeroUuid on stack
add storage delete functionality
generalise user handling more so that not only signup and login is possible but also password or userdata changes and further administration.