Fiji Archipelago Updates

In this pull request:

* Support for network parallel alignment in TrakEM2
* Fixes for a bug that could cause the cluster to block indefinitely
* Introduction of a "Bottler" concept, to allow for Object translation between master and client nodes, including Objects that are not Serializable.

TrakEM2 Archipelago is not yet included in the src-plugins pom.xml because it depends on a pull request to the TrakEM2 submodule in order to compile.