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Backtraces have sadly been broken from some time, and it was a major
pain to find the source (still searching). This commit removes all the
self rolled code with the backward-cpp library
(https://github.com/bombela/backward-cpp)

This library features a much more comprehensive set of options, pretty
printing and deals with dependencies for us.

David Frank authored Dec 27, 2021 and Tobias Lasser committed Jan 07, 2022

Instead of first creating a WLSProblem and passing that to the
constructor, you can now pass the projector and the sinogram to the
problem. The constructor initializes a very basic form of tikhonov
regularization, for other forms, the other constructors should be used.

David Frank authored Dec 27, 2021 and Tobias Lasser committed Jan 07, 2022

Instead of constructiong `L2NormPow2(LinearResidual(A, b))`, you can
now simply write `L2NormPow2(A, b)`.

This commits adds some default hooks provided by pre-commit, such as
hooks to check for too large files, or to prevent committing to master,
or files with unresolved merge conflicts.

Check the contribution guide on how to use the hooks

Some styling choises of our in-code documentation just doesn't looks
nice in the output of the docs. Here, I've mostly fixed the '@author'
tag. Instead of having each author in their own tag, just have the tag
and then a list starting in the next line.

elsa::complex is an alias for thrust::complex when quickvec is enabled,
and for std::complex otherwise

* Pass a default config to DataContainer.format, such that it can be
  passed in from the outside
* Move `format_config` into separate file to not create dependency cyles
* Add functionality to suppress or round small numbers to 0, such that
  instead of -1.49012e-08, only 0 is printed

In case of an error, print a version of the clang-format command
that will actually fix the error and not only print to standard out