Preference to make site "read-only"

[thenetdragon]

When we create a site where we have read/write access,
we should have a preference for "read-only" access if
we don't want to risk accidentally modifying files, and
we only need read access to the server. In that case,
the Filezilla client would deny sending and deleting files
even if the server would have otherwise let us.

[Tim Kosse]

Implemented in FileZilla 3.

Create some sitemanager entries and copy the resulting sitemanager.xml into the program directory with the name fzdefaults.xml