Made a new branch with still the dummy-identifyer

Robins identifyer seens not to be done.
Changed db backend to mysql

Temporary disabled multi-db-support
Client no longer hangs when server dies during readline.
Authentification on pbkdf2 base

TODO: Multiple requests after one authentication.
only one authentication for all uploads
The same file is not indexed/uploaded again now.
Re-added (clean) support for multiple events per file.
new skript 'tools.py' to create users

by invoking
./tools.py server.conf adduser
a new user is created and the line for the client.conf is printed out.
all previous entries for this user are being deactivated.
Now using the real identifyer. Works!

I had to change something in the identifyer, so it is compatible to python3.
The whole program seems to work as a first version! :)

TODO: The Identifyer needs to identify events which are not today.