Feature Requests - Invert Negatives + Forum Search

Hi there! It would be really useful for me to have the option to invert negatives; I also shoot analog and I have quite a few black&white and color negatives. It would be very good to be able to do a quick inversion to check how they look. I know that, especially for color, inverting negatives is a mixture of science and art, so I am not interested in final, production-class results, but something quick & dirty to get an idea. Maybe there is already a way to do it, but I do not know it.
 
The second request is that I have not found a "search" engine for the forums; before posting this question about negatives I tried to do a search to avoid duplication, but I have not found a "search" button.
 
Thanks!