* Ada Utility Library 2.6.0
- update crates for the new version of Ada Utility Library
- convert the crates to use nested crates
* Remove (temporarily) the utilada_aws-2.6.0 because building AWS fails
(the issue is not related to utilada_aws but it is caused by a bug in
the automated build which fails building AWS for Debian and Fedora,
see https://github.com/alire-project/alire/issues/1394)
Also applied the rest of transformations described in alire#227: no top-level
[genera] table, name/version keys, [[depends-on]] array instead of table.
Stephane Carrez
Fabien Chouteau
Alejandro R. Mosteo