In order to use the Geldschieberbot with a daemon we must extract
sending and message selection from the Geldschieberbot class.

In order to not break current 'on-shot' setups the geldschieberbot.py
file compensates the extraction of configuration and message handling.

All recipients receive amount making transactionswith multiple receipients
a shortcut for posting the same transaction with a changing recipient.

!schieb 5 alice bob

is equivalent to

!schieb 5 alice
!schieb 5 bob

Aliases are supported as well.

Move tanken code into Gelschieberbot to simply expand aliases in drives.

Aliases can be used where one or multiple persons names can be used.
An alias is expanded to the list of users it represents.
For commands implicitly including one user (e.g., 'split') the expansion
of the implicit user can be prevented.