Core: improve coding style
Core: improve history code
Core: improve history code
Core: improve history code
Core: do not derive Database from DBHistory
Core: simplify code
Core: prepare differentiation in handling history actions
Core: only store the parameters for insert query
Core: only store the parameters for delete query
Core: store id only once in history per row
Core: remove redundant query
Core: only store the parameters for update query
Core: improve variable names
Core: remove no longer used database values
Links: adapt to new core API
Core: allow registering history action handlers
Organism: handle own history actions
Links: handle own history actions
Deprecate provides_history_actions parameter in .info files
Organism: only store the parameters for insert query