acl_getf_global inconsistency

acl_getf_global does not check the global permission setting if a local option does exist.

This causes some unexpected issues because of inconsistent use of acl_getf_global.

Some places check acl_get and acl_getf_global, which together check all local forums and the global setting, but others just check acl_getf_global (probably because it was thought that it would return true if they had that global permission setting set).

An example of the inconsistency is the U_MCP link and the mcp.php page, U_MCP checks both for m_ and mcp.php checks acl_getf_global for m_. So if the user does not have any local moderator permissions set, but global ones, they can see the U_MCP link, but not actually go to the mcp.php because of a not authorized error.

So the options are:
Change acl_getf_global to always check global permissions, even if local permissions exist.
Check and change all uses of acl_getf_global to make sure they also check acl_get for the global setting.

I believe the first option would be the expected behavior, since a global setting of yes means they have permission in all locals.