tomoscan.io: replace HDF5File by silx.io.h5py_utils.File

See merge request !177

Add fscan

See merge request !168

* append recursive option
* reuse it on Fscan to reduce code duplication

improve GitlabProject: move `download_file` and `download_folder` under GitlabProject.

See merge request !176

Automate deduction of what will use LFS and what is a folder and what is a file.
Update API accordingly

move from `edna-site` to `ci_datasets`

See merge request !172