Support more advanced exclude configuration

[Michael Ekstrand]

It would be useful for Deja Dup to support optional advanced configuration of Duplicity's various include/exclude options. In my current backup system (shell scripts around rsync), I have some nontrivial excludes to exclude things like all target directories in Maven projects in my Eclipse workspace, all Firefox caches, and a bunch of generated files in other areas. In order to move to Deja Dup, I would like to be able to replicate substantial portions of this configuration.

Duplicity already supports most of what I need through options like --exclude-globbing-filelist, but as near as I can tell this option is not exposed in Deja Dup. It seems that adding an "advanced options" option to the include/exclude config that allows users to manually enter globbing filelists would allow experts to have substantially more control while not interfering significantly with Deja Dup's core simplicity.

And additional option to turn on '--exclude-other-filesystems' would also be nice, and would take care of the '.gvfs' exclude as well as making sure that things such as encfs mounts aren't backed up.

[Shahar Or (mightyiam)]

I want to take on this task.