Provide Target Platform through p2 target definition / oomph targlet

[cleanerx]

I tried to check out the sources.
As part of that there is a script to be executed that does download necessary artifacts.
Unfortunately I'm behind a proxy that requires a proxy password which is not supported out of the box with ant / java. If it would use the p2 mechanism eclipse infrastructure would be used in order to obtain artifacts which seems straight forward. Is there a particular reason for this ant script ?