New Maven module organisation

[marco-brandizi]

The current Maven architecture is way too cumbersome for the current use we make of the code reference.

Among other changes, we might simplify things this way:

• server-datasource-api could become a more generic knetminer-web-core, which would also include part of client-base and knetminer-initializer
• server-datasource-local, server-ondex, server-base and aratiny-ws could be merged into the same WAR module, we don't need the conceptually abstract server-base module, we only need to keep som separation between the API interface and its only implementation.
• Similarly, client-base and aratiny-client could be merged into the same WAR. This would also make Javascript development quicker.

To be investigated better.