apply Ole's changes to db branch
fix imports
added missing file
restored status quo after destructuve branching attempt
unit manager
unit manager db integration
added example for first demo
working example code for first demo
added demo slides
demo snapshot
fixed tests
some last minute fixes ;-)
another quick fix
removed unnecssary code
more conistent bulk ops
cleanup, doc generation, etc...
some parameter name harmonization
fixed example
updated docs
more documentation improvements