changed again the interface of SplitArray: the number of groups and elements per group don't have to be a template parameter, instead they are now specified in the constructor

ConfigReader: make exception what() message more elaborate when not finding a variable in the config file in get()

Extended the SplitArray modules to also allow splitting into multiple arrays of the same size. This breaks the interface of the old modules, but they were not yet used anywhere so this should be ok.

configuration variables are now provided to the receivers right away without any read(). Updates will never be sent.

allow obtaining the config values already before connections have been made through a speicial get() function

fixed connectTo() so it now uses the dynamic/virtual model and thus obeys e.g. eliminated hierarchies etc.