Change bins in mask for sinogram message to use info()

[robbietuk]

Changes in this pull request

This pull request includes a change to the CreateTailMaskFromACFs::process_data() function in the src/scatter_buildblock/CreateTailMaskFromACFs.cxx file to improve logging by replacing std::cout with the info function from the Boost library.

Testing performed

Works on my machine 😄

Related issues

Checklist before requesting a review

• [] I have performed a self-review of my code
• [] I have added docstrings/doxygen in line with the guidance in the developer guide
• [] I have implemented unit tests that cover any new or modified functionality (if applicable)
• [] The code builds and runs on my machine
• [] documentation/release_XXX.md has been updated with any functionality change (if applicable)

[KrisThielemans]

the info function from the Boost library.

obviously, info is from STIR 😄

[KrisThielemans]

pre-commit failures (i.e. formatting). Please follow instructions at https://github.com/UCL/STIR/blob/master/documentation/devel/git-hooks.md

[KrisThielemans]

Looks like we need to include boost/format.hpp explicitly to be on the safe side (or do we already?). Sorry that I didn't see this earlier