Add visual feedback to OTA updates on Kindle

Dry-coded
Visual feedback on update end, successful or not
Minor cosmetic tweaks
Handle the new 4GB PW2 models
Rename the shell helper 'library'...

Because Kate is being stupid.
Don't restore permissions when untaring

We're running as root, so those aren't the defaults,
but we're unpacking on vfat, so trying to preserve permissions
fails horribly.
Don't sleep during eips calls for the tar feedback
Merge pull request #754 from NiLuJe/master

Visual feedback on KOReader start & update on Kindle