Some reindent & clean up
Some little correction for better consistency.
NetworkMessage with list removed

Now, huge data will be sent bit by bit so as to prevent the app from
crashing and to have a more fluent feedback
Addition of the collection_id element in NetworkMessage.

Provide a way to send a collection of elements through multiple
NetworkMessages.
Many Networkmessageable are now compatible with the new implementation
Clean up done by Eclipse
Addition of some debug messages