* Replace license text in headers with SPDX identifiers.
* Remove specific license info from outdated readme.txt, instead leave details
to the source files.
* Add list of SPDX license identifiers used, and corresponding license texts.
* Update copyright dates while we're at it.
Ref D14069, T95597
The ustring is not a trivially copyable object from the C++ standard
point of view, so using memcpy on it is strictly wrong. In practice,
however, this is OK since it is just a thin wrapper around char*.
For now use explicit cast to void* same as it was done in other places
of ccl::array implementation. But also localize the place where memory
copy happens to make it easier to support proper non-trivial C++
objects in the future.
Remove prefix of filenames that is the same as the folder name. This used
to help when #includes were using individual files, but now they are always
relative to the cycles root directory and so the prefixes are redundant.
For patches and branches, git merge and rebase should be able to detect the
renames and move over code to the right file.
