Show only changed files and snapshots

[Germar]

There should be an option to show only snapshots and files (and the hierarchy of folders containing files) that have changed since the last back up. Also, if hidden files are not shown, then they should not be taken into account when showing changed files, folders, and snapshots.

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Imported from Launchpad using lp2gh.

• date created: 2013-03-12T19:28:41Z
• owner: mdspencer
• the launchpad url was https://bugs.launchpad.net/bugs/1154271

[emtiu]

Related to #406.