enigma2 20130220 (master) -> 20130314 (master)

enigma2 20130220 (master) -> 20130314 (master)
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- added support for more png types (32bpp, < 8bpp, ...)
  but please DONT use 32bpp generally.. read the pngquant doku.. you can easily
  configure it to convert PNGs to 8bpp indexed mode when no quality loss
  is expected
- added support for nicer (vertical) scrollbars (please ask for demo skin if you want to use it)
- fix disabling subtitles (after service change)
- fixed crash in satconfig dialog on cancel press in "Delete no more configured satellite?" choicebox
- ask for user skill in configuration wizard
- ask for multiple bouquets support in configuration wizard
- add channelselection context menu hook for plugins
- disable hack for non dvb compliant multichoice irdeto epg because it breaks epg of other dvb compliant epg providers
  please report tsid/onid/orbital position of transponders which need this hack.. so we can re-add a better workaround
- finally fixed twisted reactor