Remove validation warnings to stdout

[sudo-bmitch]

Based on our discussion on the June 6th call, we decided to remove the warnings from the code and focus on only things that trigger an error. We had not been maintaining the existing warnings. Anything that only prints to stdout/stderr was deleted since it's unlikely anyone is using that. Private functions that only triggered a print to stdout were deleted.

If others want a stricter validation, those on the call felt it would be better for them to perform that themselves rather than adding new code for OCI to maintain.

Fixes #686.