Add named task groups

[vitonsky]

Named task groups:

tasks:
  archiveHome:
    - run: makeUserHomeArchive
    - run: cp ~/homeArchive /path/to/device

  backupDevice1:
    # Task may have name
    - name: 'Copy files to backup disk'
    run: rclone /path/to/device /path/to/local/mirror1

    - name: 'Upload to S3'
    run: rclone /path/to/device s3Replica:backups

    - name: 'Replicate on server'
    # Just run replicator on server with their own config and end locally
    run: ssh replicator@backup-server 'nohup replicator ./backups.yml > ./replicator.log 2>&1 </dev/null &'

With ability to run multiple groups replicator archiveHome backupDevice1

It is useful to run some tasks by CRUD, for this example run only replicator archiveHome