Increase maximum length to account for longer fact values

Errors were reported when running the script with new data sets
with very long comments in values, coming from the World Bank.
Add commit hash in message at end of shell script

This removes the need to open import.sql right after
the import to find the latest commit hash.
Use a separate INSERT instruction for each fact

With over 60,000 facts, a single INSERT with all records
exceeds the maximum capacity configured by default in
MySQL server of the buffer for instructions, which
results in the following error:

ERROR 2006 (HY000) at line 33: MySQL server has gone away