Feature: split `NEW` directory filter into `NEW at right` and `NEW at left`
When you are comparing 2 directories, if you just care what is at the left directory that is not on the right directory (or vice versa), it would be handy to filter just what is new from one way. If you care what is new from both sides you cold just mark both filters.
As a case of use, I am creating a code-generator that generates code for a framework, so when I use meld to see the new files I get the whole screen full of files that are in the framework but not in the generator output (since I generate far fewer files than the ones that already exists on the framework) and searching for the files that are only on the generator output is quite hard.