4.4.2 - simple queries
4.4.2 - qeval and driver loop
4.4.3 - some notes and done

maybe this is the last commit before I leave.
Have fun in Japan then!
ex 4.64 - two queries that "looks the same"
ex 4.64 - some explanation
ex 4.64 - done
fix database typo
ex 4.65 - done
ex 4.66 - done
ex 4.67 - skipped *******
ex 4.68 - done (using prolog)
ex 4.69 - ends in grandson
ex 4.69 - done
qeval - code for driver loop
qeval - instantiate
qeval - eval procedure
qeval - simple queries
qeval - compound queries
qeval - filter
qeval - main file