Upgrade to Openwebif 2.x

Hello!

Openwebif has been updated to version 2.x a while ago and it has a feature that is kind of essential for me.

When I try to upgrade to it in the latest OpenPli 9.1, the suggested installation process

## connect to your enigma2 device via SSH/Telnet, (eg. `ssh root@boxip`), then
# change to the temp directory
cd /tmp
# shut down enigma2 gracefully
init 4
# fetch OpenWebif ipk
wget -O openwebif.ipk https://github.com/oe-alliance/OpenWebif/raw/gh-pages/enigma2-plugin-extensions-openwebif_latest_all.ipk
# install downloaded ipk file
opkg install openwebif.ipk
# restart enigma2
init 3

generally works fine but Openwebif doesn't start afterwards and instead I see a No module named "Tools.copyFiles error in the plugin menu.

Any help on how to get it up and running would be very much appreciated.

Thanks!