Fix back to nickel in 3.4.1
Kobo has firewall disabled (and to iptables binary)
read/save document settings in document sidecar too
flush reader settings when closing readerui
Merge pull request #689 from pazos/master

fix back to nickel on 3.4.1 for kobos
Merge pull request #688 from chrox/master

hold on config panel option/zoom mode menu to set default option
remove benchmark in testfront