Tipafriend as policy function

*Title: Tipafriend as policy function.

*Documentation:
The 'tipafriend' function was added to the list of policy functions
for the module 'content'. This provides posibility to differentiate
rights for the tipafriend view between different groups of users.
From now, you have to add 'content/tipafriend' policy to a role to
make available tipafriend view for a specific user group. And also
note that a group should have proper 'content/read' access to have
possibility to get access to the tipafriend view.

*Upgrading:
After updating from previous versions of Exponential, you will discover
that all your users will not have access to the 'tipafriend' view
by default, because there is no proper 'tipafriend' policy in roles
assigned to your user groups.
Thus there was added upgrade script to solve this problem. The script
optionally adds a new role to your system and assigns it to every top
user or user group. This role contains only one policy that enables
access to 'tipafriend' view.
The script is placed in 'update' subfolder and must be run from the
root of the system:
'update/common/scripts/3.10/updatetipafriendpolicy.php'

The script requires three parameters:
 --siteaccess=<siteaccessname>    admin siteaccess where new role
                                  should be added in.
 --login=<admin_login>            administrator's login
 --password=<admin_password>      administartor's password to get
                                  admin access to a system to be able
				  to add new role.