[cmake] Fixed cta/CTA#872 Fix naming convention bug in CTA/cmake/Findxrootdclient.cmake found by cmake3

Implements "cta-admin failedrequest rm"

See merge request cta/CTA!8

Also deletes all unused options which were defined for commands that
no longer exist

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