Bugfixes and minor changes:

• FTP: do not use the default impersonator during the test of the FTP connections.
• Fixed bug that reversed mount point precedence, giving priority to group mount points over user ones; user mount points now correctly take precedence.
• Fixed bug that made the %<home> placeholder not work in case "Use system credentials to log in" was selected but "Use system credentials also for accessing &files and directories" was not.