Fixes related to netcvupdate and lftp and others

• fix lftp support for netcvupdate and cam_menu.c
• add new options for plugin: --netcvupdate-use-lftp --netcvupdate-enable-debug
• fix some log statements and REELVDR related defines

Build for Fedora Linux can be found here
https://copr.fedorainfracloud.org/coprs/pbiering/vdr_extensions/packages/