FW E2: Merlin4 (OE 2.5) (28MAR7)

Merlin4 (OE 2.5) for Dreambox DM 520/525.

- Merlin4: 

--> PiconLoader: fix for new tuner type detection. Should work with multitype tuner as well now
--> PiconMapper: fix crash when trying to map not existing channel
--> ChannelSelection: fix for inBouquet check being shown in Favourites when zapping with 0
--> AddOnManager: fix for getting whole plugin-name after splitting for "-"
--> Polish locale file update