Cambio en el template del nagios
New class BalancedServices. It has an Ip and multiple machines.

In the nagios cheks there is a new attribute (Balanced).

In the nagios view, there is a new default template (default_checks.cfg)

In the nagios hosts view, the BalancedService are listed

In the nagios services view, for each BalancedService, are listed all services check marked with Balanced

!!! Change in the nagios model:  NEW balanced atribute !!!

CREATE TABLE `nagios_nagioscheckopts` (
    `id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY,
    `check_id` integer NOT NULL,
    `machine_id` integer NOT NULL,
    `options` varchar(500),
    `balanced` bool NOT NULL
)
Modifying the update-list view to only show linux machines.
Adding a view to update the up_to_date_date machine field.
Fixing some typos in the update_list view.
Changing the color scheme for the last_update column of the update-list view.
Modifying the update-list view to mark as "updated" only the machines updated one week before.
Removing EPO level column from update-list view
Merge branch 'master' of https://github.com/tic-ull/arritranco