Re-open method SqlQuery#Q from(Expression<?> arg) as public

[ulk200]

I used to be able to set FROM with basic "Expression<?>" objects.

In ProjectableSQLQuery

public Q from(Expression<?> arg) {
  return queryMixin.from(arg);
}

But with the fix from issue #251 this signature has been made protected.
My main usage is calling it with Template expressions with Oracle's procedure call, generating an sql like SELECT ... FROM TABLE(PROCEDURE(...)) a by passing Expression.template(Tuple.class, "TABLE(PROCEDURE(...)") to the method.

Maybe i'm missing something and this can translated to a RelationalPath ? (because is see that from(RelationalPath<?> arg) is supposed to be the new way of setting the from expression)

I'm using QueryDSL SQL without JPA BTW

[velo]

Feel free to send a PR, I will review