reconstruct world from database logs
added function documentation
removed "default" genome as list of bases needs to be given
reconstruct list of agents/organisms from database logs
added db_reconstruct_population() function
catered for parent(s)' identity to be recorded in offspring(s)' status as status['parents']
Merge pull request #8 from mauriceling/master

1. helper functions to reconstruct simulation from database log. 2. infrastructure for logging parental identities in children status dictionary