- check and export variables for use in scripts!
- documentation: -F / --filter for rsync
X join todos
- fix possible quoting problems
   * rsync_extra (redefine format)
   * exclude
   * other
   * create _rsync, filtering args, creating new $@
- remove exit-calls
   * will leave behind unused temporary file!
   * use _exit_err
- replace nico-linux-ccollect with nico-ccollect
   * ccollect is not Linux specific