change CODE URL from FTP to HTTP

alexrequested to merge
CODE_HTTP into master

See issue report on the old prefactor github page: https://github.com/lofar-astron/prefactor/issues/297

as well as commit to master: https://github.com/lofar-astron/prefactor/commit/73809818e7cfac171ce91a12024b7ca10552eee2

Edited by alex

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