David Frank authored Jun 24, 2021 and Tobias Lasser committed Jun 29, 2021

This commit changes the pipelines to use the newly created docker
registry. The docker registry is running at vmlasser7.in.tum.de with
port 5000. You'll need the credentials and run 'docker login
docker.ciip.in.tum.de:5000' to pull and push images to the registry.

A new variable 'DOCKER_AUTH_CONFIG' is set up in GitLab to manage the
authentication inside of the CI pipeline.

This is a follow up to !142, more tests use the assertion macros with
*_EQ, *_UNARY and such. This commit also fixes many warnings in the
tests with conversions.

Further warnings are fixed in many places such as the CUDA projectors,
the Dictionary operator or the SQS solver. As the last thing, this
commits adds a new overload of isApprox for Expressions.

With this commit, elsa basically without warnings on GCC 11 and Clang 12

David Frank authored Jun 21, 2021 and Tobias Lasser committed Jun 28, 2021

Changes to the underlying implementation were necessary to accept
generals ostream and istream instead of the more specialiced ifstream.
This limitation was unnecessary und now EDF::write and EDF::read can be
called with a ostream and istream respectively.

A future MR should add tests using these functions to porperly test the
underlying implementation.

The Timer class now prints timing information only if the Logger is set
to debug level, instead of info level. This reduces noise in the output.
The Timing of execution is not necessarily an useful information all the
time.

An example is the python script introduced in !182, all useful
information regarding conversion and solvers is shadowed by the Timing
information.

Some tests have extraemly long runtime especially in debug builds. This
commit reduces the runtime ~3x on my personal machine, hopefully the
effect is even more pronounced on the CI.

Closes #129

At a couple of places a new unique_ptr was created, then directly
dereferenced and a copy of the underlying VolumeDescriptor returned.
This creates an unnecessray heap allocation. This commits directly casts
the reference of the smart pointer to a VolumeDescriptor and from there
the copy is created.

Remove dynamic_unique_ptr_cast and static_unique_ptr_cast as both is
covered by the downcast functions in TypeCasts.hpp.

This fixes a couple of bugs in the downcast implementation:
* In some cases the const was not correctly copied
* unique_ptr overload ignores deleter now, as it can give errors for the
  default deleter (which we use), if needed we can provide an overload
  in the future.

The reference overload is now similar to the pointer one from an
implementation perspective, but instead of returning nullptr it throws a
BadCastError.

This commit includes fixes for warnings:
* Fix warning -Wmismatched-tags for Backtrace
* Fix -Wunused-parameter warning in RepresentationProblem
* Fix all warnings from ml module (mostly conversion)

Now the library elsa builds without any warnings again

Closes #127

Depends on !175

Some more functionality was added with the TypeCasts.hpp file:

* is(...): check if a pointer/reference/unique_ptr can be dynamically
  casted to the derived type
* downcast(...): downcast a pointer/reference/unique_ptr statically to
  the derived type, assumes caller knows that the type is correct.
* downcast_safe(...): downcast a pointer/reference/unique_ptr to the
  derived type, but only if it's possible. If not a nullptr is returned
  for the pointer cases and std::bad_cast is thrown for the reference
  case.