- fixed regression, ece-imort::http-and-ftp::download_files_if_desired
  somehow got  a derived variable, instead of its loop local variable.
- added basic HTTP proxy support to ece-import (for use cases were the
  user cannot/doesn't want to set the http_proxy environment
  variable).

  You can now specify an HTTP proxy with the new --http-proxy
  parameter.

     ece-import --http-proxy proxyserver:3128 download-import-data

- moved method is_escenic_xml_ok from ece-import to common-ece as this
  might prove useful for other modules too.

- added common-ece to the ece-import dependency list