ods: OdsSourceManager save server name in shared prefs

... otherwise sync manager cannot read changed values
pegelonline: change source to PegelOnline site

They offer some more data which has not been included in the ODS
pegelonline: save some characteristic values as well
ods: cleanup in Processor and removed PegelonlineParser

It wasnt being used by anyone
ods: debug msg when fetching data
levels: added some characteristic series