Function get_crate_from_comp_dir

Function that returns a `Crate` instance from the compilation dir. Usually, for an external crate, the direactory has the format '/path/to/checkout/ - In that case, `Crate { name: " ", version: Some(" ") }` is returned. Some special cases are: - When there is no numeric char after the crate name, it is assumed the version in not known. In that case, the `vers

(comp_dir: Option<&str>, rust_version: String)