import cleanups

Bert Palmrequested to merge
data_class_import into develop
  • moved saqc.core.register._isflagged to saqc.lib.tool.isflagged
  • moved saqc.core.{reader, visitor} to saqc.parsing.{reader, visitor}
  • added saqc.core.frame module that acts as a bridge to out data-collection-class (currently dios.DictOfSeries)
  • removed all direct imports of dios
  • cleand up imports (always import from the highest possible level)
  • moved SimpleScheme from saqc.core.basescheme.py to new file saqc.core.translation.simplescheme.py
  • cleaned constants.py to only hold real constants

i removed all direct references to dios, to simplify maintenance of out dataclass and in preparation of the new data container

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