QCH

[Jonathan Riddell]

Frameworks have gained QCH generating abilities which is a doc format
used by Qt Creator

Alas it needs a new Doxygen and new Doxygen seems to need llvm 4.0
which is in xenial-proposed so maybe we'll get it shortly but not yet
https://launchpad.net/ubuntu/+source/llvm-toolchain-4.0/1:4.0-1ubuntu1~16.04.1
https://bugs.launchpad.net/ubuntu/+source/xorg-server-hwe-16.04/+bug/1687981

Jonathan