changes in build.xml files

[Sim IJskes - QCG <si...@qcg.nl>]

I've tried to create some dependencies in the build files.

It must be possible now to change a java file in the 'river-runtime', 
run 'ant run' (in qa) or 'ant qa.run' in the river root, and you must 
see some optimisation in the build. It's by far not perfect yet.

There is a primitive optimisation in the river-runtime dependency build 
around the riverruntimelastbuild file. This file is touched when the 
river-runtime has been built by the qa. When you change something in the 
sources of the river-runtime this will be picked up by comparing the 
timestamps.

I've tested several use cases of the build file on my workstation, but 
i'm sure i overlooked something. If you happen to find it, please let us 
(river-dev) know.

Gr. Sim

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