#33 Update modules to Eclipse 3.0 and Ant 1.6.1

[Aleksandar Vidakovic]

As most(?) of the keel developers are using Eclipse 3.0
following keel modules should be upgraded to match this
environment. There are still references to Eclipse 2.1
and Ant 1.5 in following modules:

- app-eclipse-swt-example
- app-installer
- clnt-eclipse-swt
- plgn-eclipse-askquest
- plgn-eclipse-configurator
- plgn-eclipse-spawn

There should also be an eclipse variable that defines
which platform dependent swt.jar to reference. If not
one has always to change the .classpath file for the
appropriate platform (win32, gtk etc.).