[Duplicity-tracker] [patch #6298] URI unquoting patch for FTP backend

[Darik Horn]

Follow-up Comment #4, patch #6298 (project duplicity):

Using ftp://address@hidden//path to get an absolute path on the FTP server is
incorrect in any context, within or without a chroot environment.

The reason for change would be standards conformance and general convention. 
Otherwise, duplicity has a barnacle.  (This kind of thing happens because many
FTP implementations do what you want, instead of what you ask.)

The ncftpls man page has this commentary on the issue:

Note that the standard specifies that URL pathnames are are relative
pathnames.  For FTP, this  means that URLs specify  relative pathnames from
the start directory, which for user logins, are typically the user’s home
directory.  If you want to use absolute pathnames, you need to include a
literal slash, using the "%2F" code for a "/" character.  Examples:

$ ncftpls -u linus ftp://ftp.kernel.org/%2Fusr/src/
$ ncftpls ftp://address@hidden/%2Fetc/

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