New catalogue table and respective cta-admin diskinstance and
cta-admin diskinstancespace commands

Activity Mount Rules associate a Mount Policy to an activity regex.

When recalling a file, the users can specify an activity (i.e. by using
filepath?activity=x). If specified, this activity will be used to select
a matching activity mount rule, if one exists. If more than one Activity
Mount Rule matches the activity, the one with highest retrieve priority
will be chosen.

Acitivity Mount Rules take precedence over Requester Mount Rules.

Restoring deleted files implies restoring them in the eos namespace and
in the cta catalogue. The command has no atomicity guarantees, a file
may be restored in the eos namespace but the restoring in the cta
catalogue may fail.

Add youngestjobcreationtime to archive and retrieve queues in the
objectstore. The change is backwards compatible, as the new field is
optional and with a default value of 0.

The field is updated everywhere in the code where oldestjobcreationtime
is also updated. The value is printed per queue using cta-admin sq.

Allows for the removal of a tape file copy by specifying its vid, copy number and  archiveFileId or eosfxid and diskInstanceName

Fix last column alignment when more than 1000 items are listed in a cta-admin command output (#1014)

cta-verify-file command now gets instance, request.user and request.group from the command line instead of /etc/cta/cta-cli.conf

- next mounts was introduced to anticipate the drive dedication
  implementation. As it is not implemented, it is removed from the cta-admin sq output

Catalogue::getCachedVirtualOrganizationByTapepool() + VO added to the DriveState object + VO and read/write max drives added to the getQueuesAndMountSummaries method

- Objectstore definition modified : there is no maxDrivesAllowed item
  anymore