Information is not a countable noun in English (it can't be plural).

Here is an example:
```
[itctabuild02] ~ (krb5=ctaadmin1)> cta-admin tapepool add --name steve --vo vo_1 --partialtapesnumber 1 --encrypted false --comment "Steve's tape pool"
[itctabuild02] ~ (krb5=ctaadmin1)> cta-admin archiveroute add --storageclass single_1 --copynb 1 --tapepool steve --comment "Steve's archive route"
[itctabuild02] ~ (krb5=ctaadmin1)> cta-admin tapepool rm --name steve
Cannot delete tape-pool steve because it is used in an archive route
[itctabuild02] ~ (krb5=ctaadmin1)>
```

Fixed cta/CTA#863 Prevent SQLite database files from being used as the CTA catalogue database backend

Created cta-lib-catalogue so that cta-migration-tools can avoid requiring cta-lib which in turn requires librados2

Removed 'LEFT OUTER JOIN' clauses from the SQL statement of RdbmsCatalogueGetDeletedArchiveFilesItor

Removed deadwood forward declaration of Catalogue class from ArchiveFileItor and DeletedArchiveFileItor

Removed superfluous copy of rdbms::Conn object passed to RdbmsCatalogueGetArchiveFilesItor() constructor.

Do not use cta-catalogue-schema-drop to wipe a sqlite database because in this case we need to cleanup the full database directory