Fixing gravity table corruption bug when pulling.

[theobjectivedad]

Fixes #32

Root cause: Basically, a hard drop of adlist and domainlist corrupts FKs in $gravity_db. Also, the way CSVs were imported caused data type corruption. This update will correct both issues.

[stevejenkins]

Thanks @theobjectivedad. I'm reactivating this project. Would you mind checking to see what's conflicting with your proposed merge? Thanks!

[hamah99]

any chance we could see these fixes merged?

edited to remove suggestion that theobjectivedad's fork doesn't work in a container environment on the pull side. It seems to work ok. I had not gone through the pihole-cloudsync setup process again.