Fix issue in OGR python services, thanks to Farkas to point this issue. Update Java support to handle properly the error messages coming from the JVM. Fix segfault when ZCFG file doesn't exist.

git-svn-id: http://svn.zoo-project.org/svn/trunk@388 4b6b6ad6-68b3-4dcc-9231-bd9b83bc5dc3