fix AT UI for description match
use ChannelSelection for service ZAP (select new service in service list and keeps zap history)
The OpenWebIF API for zapping can be used everywhere, so we don't know which bouquet should be choosen.
So we have to search the service in bouquets to select the service in service list.
The first bouquet in which the service is available will be selected, if no bouquet in TV mode will be found
the service will be searched in the radio mode bouquets. If the search ends up with no result the service will be selected in the "ALL SERVICES" list.
Fix disk size calculation

Even a freshly mounted harddisk with no files on it would appear as if Gigabytes of place had been filled already.

This was caused by hdd.capacity reporting Electrician's units while we were using plain MB/GB for free space.
Optimize hdd size calculation

Optimize hdd size calculation and also calculate the nominal capacity of the drive(s)
Show nominal capacity of drive(s) also