Squashed '.pointless-xcompose/' changes from 4e8cda2..85efc66

85efc66 Remove all duplicates and conflicts with system en_US.UTF-8 Compose file
fd68321 Improve documentation of conventions
7fa9552 Ignore intentional conflicts in scan4dups.py
11604c4 Remove check-overlap, it's duplicated by scan4dups.py
6eccbb0 Overhaul and streamline
0f7507f Fix a conflict with the system bindings

git-subtree-dir: .pointless-xcompose
git-subtree-split: 85efc66901a6374e2846f243dd453727d6594de5
pointless-xcompose: Merge '7f6ecf2edcd2bc4f588f9bc271346fade230f62f'