Friendlier group permissions

[dnylpz]

having an sticky bit seems unnecessary as it will enforce having those permissions set up and avoids deletion and mv's from groups users, since first run until root/owner comes and modifies them which is not something you always want, group should be able to modify those perms and children directories permissions too.

i would suggest to remove that line entirely but since it would block the user to make any further modifications too i think this is a better solution.

directories require execute permission to be able to cd /dir so execute permission should also be added.

also, defaulting to full perms to all linux users seems insecure, so 0770 seems like a better solution.