[code cleaning] Missing public function get_subs in class.locations.inc.php

Hi all,

I'm still fighting bugs to move microstep by microstep to see .18 out
before i'm 120 years old :)

litle bit of progress today : i have a nearly installing phpgroupware
(well install does not die any more and it goes from the beginning to
the end, i can log in but there are no app available at all : just
about, home and logout)

i'm splitting the changes i made into small patches to avoid the giant
commit effect with many different things inside : each commit will
address a specific issue :

that will make patch review easier (and also make reverts easier in case
i made a mistake)

Among the issues, i found that get_subs() of class.locations.inc.php is
called from class.acl.inc.php but does not exist... with an empty method
i could prevent phpgw from crashing but i guess this method is supposed
to do something

Can someone help me either giving me the code of this method or
explaining what it is supposed to do ?

cheers,
maat (micro bug chaser)