and notify if there are invalid blocks. Removed validating per tx during
import which speeds up import 5-10% on small graphs and more on larger
graphs. Also print some useful stats in the console
- remove sqlite-db/close! as its not used and didn't make sense to be
used in other electron ns
- remove sqlite-db/connections atom as its not needed
- remove read-graph as its not necessary
- rename cli.persist-graph as its primary purpose has changed
- update effected scripts
