Remove emacs whitespace turds left through out the file.

Curse you emacs whitespace.
Turn off AOT / :gen-class for main.

This can still be executed using clojure.main like this:

  java -cp clojure.jar:postgres2datomic.jar clojure.main -m postgres2datomic.core
Add comment about misleading 'main function.
Adding non-working example changes and notes.