+ added connectsUnit() to connectionModel, which checks if the connection leads to/from the given unit
+ added removal of attached connections to removeUnit() in scenarioModel: connections leading to/from a deleted unit will be deleted from model, too
# removeConnection() in scenarioModel now accepts only the ID of a connection as parameter (instead of the entire connection)
- removed deleteUnitFromModel() from unitModel
+ added removeUnitFromScenario() to unitController, comprising all necessary function calls for removing a unit from view and model
# merged similar but distributed unit deletion functionality from tab and modal window into removeUnitFromScenario() call; now all use the same functionality
+ added check for existence of a unit model to its click event handler: prevents errors when units are added and clicked but not named yet
+ added check for scenario name availability to newScenarioModal....: alert if entered name for new scenario is already taken
! fixed (really stupid, really) unit deletion bug (i.e. not happening): added "#" to delete unit button $-selectors
+ added TODO to loadScenario() in authorSystemController: the whole thing is stale and just won't work

# moved setLabelBtnScenarioDeletion() into deleteScenarioModalWindoeController where it belongs

# replaced unit DOM element IDs "stateX" with UUIDs
# further merged, simplified, and corrected code (matching new data models)

- removed metadataTabController script tag from html
# overall replacement of myAuthorSystem with instance of AuthorSystemContent model

# simplified event handlers for new scenario modal window input

# re-added "template" divParameterSelection in index.html to test select2 plugin (flat ui) on clone
# TODO: fix async select2 rendering (not working with dynamically generated DOM elements)

# minor changes before *the great parameter refactoring* i.e. generification, type checking, value checking, ... (to do)