PUD: do not read position file if it did not change
PUD: do not read position file if it did not change

To prepare for reading it off a timer.

Signed-off-by: Ferry Huberts <66e11f9f5d965b69497c7e73d5e808f8b13c1218@pelagic.nl>

diogomg/olsrd,ninuxorg/olsrd,servalproject/olsr,diogomg/olsrd-binary-heap,cholin/olsrd,ninuxorg/olsrd,ninuxorg/olsrd,acinonyx/olsrd,duydb2/olsr,diogomg/olsrd-binary-heap,diogomg/olsrd,duydb2/olsr,sebkur/olsrd,sebkur/olsrd,sebkur/olsrd,diogomg/olsrd-binary-heap,servalproject/olsr,diogomg/olsrd-binary-heap,diogomg/olsrd,diogomg/olsrd,diogomg/olsrd,zioproto/olsrd-gsoc2012,tdz/olsrd,zioproto/olsrd-gsoc2012,zioproto/olsrd,cholin/olsrd,tdz/olsrd,duydb2/olsr,nolith/olsrd,diogomg/olsrd,nolith/olsrd,diogomg/olsrd-binary-heap,diogomg/olsrd-binary-heap,diogomg/olsrd-binary-heap,sebkur/olsrd,cholin/olsrd,tdz/olsrd,nolith/olsrd,tdz/olsrd,acinonyx/olsrd,sebkur/olsrd,nolith/olsrd,zioproto/olsrd-gsoc2012,diogomg/olsrd,cholin/olsrd,acinonyx/olsrd,duydb2/olsr,zioproto/olsrd,duydb2/olsr,ninuxorg/olsrd,servalproject/olsr,tdz/olsrd,duydb2/olsr,zioproto/olsrd,zioproto/olsrd,zioproto/olsrd-gsoc2012,servalproject/olsr,cholin/olsrd,servalproject/olsr,acinonyx/olsrd,sebkur/olsrd,ninuxorg/olsrd,duydb2/olsr,duydb2/olsr,zioproto/olsrd-gsoc2012,servalproject/olsr,acinonyx/olsrd,zioproto/olsrd-gsoc2012,zioproto/olsrd,nolith/olsrd