Merge pull request #27 from srmo/master

[installer][host] streamline deviceselection and try to avoid checkboxes
[installer] [host] all platforms: cosmetic changes; add tr() translations;
faster extraction with bigger buffer; show success dialog after imaging.
win32: fix signals and slots; fix warning message and unmount messages: do
not show device ID during these messages; add initial support for imaging
a device.
Merge pull request #28 from srmo/master

make tab selection/order work - RETEST ON ALL HOST PLATFORMS!
[installer] [host] fix check for extractprogress status