Added uninstall cmake target

[jesper-friis]

Description

Added a uninstall cmake target, making it easy to uninstall dlite when it is installed with cmake. Just do

make uninstall

or with cmake

cmake --build . --target uninstall

This is simply a slightly adapted copy of the recipe from the public cmake documentation: https://gitlab.kitware.com/cmake/community/-/wikis/FAQ#can-i-do-make-uninstall-with-cmake

Type of change

• Bug fix & code cleanup
• New feature
• Documentation update
• Test update

Checklist for the reviewer

This checklist should be used as a help for the reviewer.

• Is the change limited to one issue?
• Does this PR close the issue?
• Is the code easy to read and understand?
• Do all new feature have an accompanying new test?
• Has the documentation been updated as necessary?

[francescalb]

Does not work for me, I can still import dlite after having run either of

cmake --build . --target uninstall or make uninstall

I am working in an environment and everything is still in the environement. Deactivating and reactivating does not change anything either.

[jesper-friis]

Does not work for me, I can still import dlite after having run either of

cmake --build . --target uninstall or make uninstall

I am working in an environment and everything is still in the environement. Deactivating and reactivating does not change anything either.

You are right, it didn't removed directories. It seems that cmake doesn't record installed directories.

To also uninstall directories, I added some extra code lines that after all installed files are removed check the parent directory of the installed files. If the directory is empty, it is removed.

This should have the expected behaviour in almost all cases, but could potential remove an empty directory in the installation path that existed before dlite was installed.

[francescalb]

Seems to work nicely.