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This ensures that small coefficients do not loose precision

Fix missing include dir for ROOT dictionary

Add missing include

Hotfix none-type issues with symmetric matrices introduced with da303fd8

TPyDispatcher has been reintroduced to ROOT:
https://github.com/root-project/root/issues/6579

I tested the ROOT 6.23/00 nightly build, and hdtv is working correctly
again (tests are also passing). The fixes were backported to ROOT 6.22
and will be available with 6.22/04. I added this information to the
README, and because no one reads the README, I also added a version
check when starting HDTV.

See https://github.com/hsluv/hsluv-python

- The current code base is mostly consistent with the LLVM style.
  The brace style seems to be inconsistent, but is close to the
  default (BS_Attach). A line length limit of 120 was chosen.
- Add black code formatter, adjust flake8 config
- Add .cmake-format.yaml
- Add .clang-tidy

python-prompt_toolkit has an enable_history_search option, but it does
not distinguish between (arrow) up/down and pageup/pagedown. Instead,
we add key bindings for pageup/pagedown.

This fixes a regression that occurred due to the switch from readline.

Insert missing header