Change option --skip-proxy to --proxy. Rename getHyperNewsName to getUsernameFromSiteDB. New wrapper functions for getUsernameFromSiteDB and getUserDN; new function getUserDNandUsernameFromSiteDB. Use getUserDNandUsernameFromSiteDB in checkusername; and in checkwrite (when retrieving username) instead of CredentialInteractions.
Merge pull request #4310 from AndresTanasijczuk/userdn

Change option --skip-proxy to --proxy. Rename getUsername to getUsernameFromSiteDB. Fixes #4308, #4309.