* added Flush method to recorder used by file loaders to update querybackend
  with barely-dumped data.

* DbInit and file loaders inject a 'AgentState_' prefix for all agents in their
  infile->db and db->agent init methods

* added Lifetime col to AgentEntry table.

* implemented model class's InitFrom(Querybackend) and InfileToDb methods.

* renamed CondInjector to QueryInjector

* added missing set_model_impl call in file loader during prototype creation