[10.0][fix] membership_extension: add security group to menu

[luismontalba]

• Add access right to the main menu "Members" to employees group, avoiding restriction for only accountants when the association module is installed.

[pedrobaeza]

This is not security. It's changing a menu field, so it should go in /views/.

Any way, this is not what we have talked. I want a new security group for granting specifically that. And check all ACLs needed to that group. Imagine you only have that new group, and you need to access the same objects in that menu than any other role with that permission.

[chienandalu]

@pedrobaeza I've made the security group, and gave permissions so a user with just this group could access to the whole features of the membership application.

[chienandalu]

@pedrobaeza Changes done (added one ACL more) and tested that a user with just Membership manager, Employee and Contact creation permissions can do all member operations except billing (for wich the Billing permission would be granted)

[rafaelbn]

Thanks @chienandalu