Feature Request: For adding/removing extended file attributes

[RPethani]

It would be great to have a way to add/remove extended file attributes. For example, If I wanted to associate different display name for file rather than original name of file. In such case, extended file attributes can come in handy.

[phimage]

Yep, currently the functions are private (_setAttribute and _setAttributes)
and all accessor are get only due to possible errors throwed