Several options were mistakenly classified as db options when in fact
they are column family options - the C interface does not make this
distinction and instead puts them all under one umbrella.
This PR updates options to use nim setter/getter properties allowing
both read and write of most options - lots of options are exposed both
for reading and writing, but hey, one could always add _even more_ of
them - there's certainly no lack!
web3-developer
Jacek Sieka