Bugfixes and minor changes:

• FTP: fixed crash if receiving an unusual sequence of commands.
• Fixed spurious error while backing up configuration.
• MSW: fixed silent crash of the installer at the end of the installation process.
• UI: fixed bug that might lead to duplicate IPs being retrieved by "retrieve public IP" button in the FTP tester.
• UI: added proper spacing between unit labels and the controls they are attached to.