Renamed "files" group into "home" to be a bit more self-documentation to the potential sysadmin

setup.src

@@ -109,7 +109,7 @@ SSH_GROUP = "ssh"
 // #0.2: users able to access the /Public/Downloads/ folder
 FTP_GROUP = "ftp"
 // #0.3: users connected to manipulate non-public files (subgroup)
-MAIN_GROUP = "files"
+MAIN_GROUP = "home"
 // #0.4: users with a private space (inherits files group)
 USER_GROUP = "members"