#16 Portable Build Files for Ant

[Christian d'Heureuse]

Please make the Ant build files (build.xml) OS independent and directory independent (i.e. no references to /opt and /tmp, only relative directory references).

In some Ant tasks, the javac classpath parameters are empty. There are .classpath files in the source directories, but those are only used by Eclipse, not by Ant, and some contain absolute path names.