Redesign of the CQi client-server protocol

The CQi protocol defines a client-server API to CWB/CQP with the following three goals:

1. provide a uniform API to corpus data and CQP queries, which can easily be accessed from all programming languages (without having to link against C libraries or run slave processes in the background)
2. allow remote access to CQP process running on a dedicated server (e.g. from thin client or Web interface)
3. enable distributed processing, where multiple (sub)corpora can be queried in parallel by separate CQi server instances (either on the same server or on different nodes in a compute grid)

The official CWB distribution currently includes the CQi 1.0 protocol specification, a stand-alone CQi server (cqpserver), and a reference client implementation for Perl. CWB users have implemented similar clients for Java, Lisp and Python with varying success.

The CQi protocol was