Added new admin command for delete taskchecks y backupfiles
Fixed comand to clean the taskchecks and change the command name to maintenance
Refactor of maintenance command to be more optimal
Merge https://github.com/tic-ull/arritranco into admin-command-clean
Merge pull request #7 from lumasepa/admin-command-clean

Admin command clean
Fixed url syntax on update machine template.
Merge branch 'master' of https://github.com/tic-ull/arritranco