fixed wrong spelling and implemented local testing
make array structure more readable and easy to access, also faster to access, removed old code
check if postmeta data has changed, avoid checking for _edit_last and _edit_lock, these are wordpress specific things to for the editor, so we should not check/update them if they come from live site
some major refactoring
a bit more refactoring, remove _DATA to make all variable names resemble wordpress db structure, code is now easier to read
everything is better as an object
remove obscure function to get tables name, added code to add new subscriber into sandbox, TODO: check ID!!!