Also applied the rest of transformations described in alire#227: no top-level
[genera] table, name/version keys, [[depends-on]] array instead of table.
- the 'ado' crate is the core library and does not contain any database driver
- the 'ado_postgresql' crate depends on 'ado' and is the PostgreSQL driver
- the 'ado_sqlite' crate depends on 'ado' and is the SQLite driver
There is missing the 'ado_mysql' crate because the library dependency
is tricky: we may need one of libmysqlclient or libmariadb libaries.
Crates without maintainer or pending migration remain in /orphaned
GitHub URLs rely on the default tarballs that at some point will
have to be released with uploaded binaries (with `alr publish` support).