changed dsl to conform to the new architecture (and make use of it).
The definition of the commands that are possible in the dsl was put into
the PduSendVocabulary class. Also changed MacAddressDecoder and
Ip4AddressDecoder to allow inputs that are greater than the maximum size
for the respective data units (probably will change in the future
because now there is no validation of the input from the user anymore).
next thing to do is to change the split method of the BitOperator to not
add any elements before the byte array that needn't be there.