do not restart a periodic timer if the callback function has stopped the timer
do not restart a periodic timer if the callback function has stopped the timer

acinonyx/olsrd,diogomg/olsrd-binary-heap,nolith/olsrd,tdz/olsrd,sebkur/olsrd,nolith/olsrd,zioproto/olsrd,ninuxorg/olsrd,servalproject/olsr,sebkur/olsrd,nolith/olsrd,sebkur/olsrd,diogomg/olsrd,nolith/olsrd,tdz/olsrd,diogomg/olsrd,zioproto/olsrd-gsoc2012,sebkur/olsrd,duydb2/olsr,acinonyx/olsrd,diogomg/olsrd-binary-heap,zioproto/olsrd-gsoc2012,brabander/olsr,ralisi/olsrd_cl_roam,duydb2/olsr,zioproto/olsrd-gsoc2012,cl4u2/olsrd-wot-pgp,diogomg/olsrd,ninuxorg/olsrd,ninuxorg/olsrd,zioproto/olsrd,ninuxorg/olsrd,duydb2/olsr,tdz/olsrd,diogomg/olsrd,brabander/olsr,diogomg/olsrd-binary-heap,sauloqueiroz/incremental-spf,cholin/olsrd,sauloqueiroz/incremental-spf,cl4u2/olsrd-wot-pgp,ralisi/olsrd_cl_roam,acinonyx/olsrd,ralisi/olsrd_cl_roam,sebkur/olsrd,cl4u2/olsrd-wot-pgp,cholin/olsrd,zioproto/olsrd-gsoc2012,diogomg/olsrd,zioproto/olsrd-gsoc2012,cholin/olsrd,tdz/olsrd,acinonyx/olsrd,acinonyx/olsrd,servalproject/olsr,diogomg/olsrd-binary-heap,duydb2/olsr,sebkur/olsrd,sauloqueiroz/incremental-spf,servalproject/olsr,tdz/olsrd,diogomg/olsrd,servalproject/olsr,cholin/olsrd,diogomg/olsrd,diogomg/olsrd-binary-heap,duydb2/olsr,servalproject/olsr,duydb2/olsr,ninuxorg/olsrd,nolith/olsrd,cl4u2/olsrd-wot-pgp,cholin/olsrd,zioproto/olsrd-gsoc2012,brabander/olsr,brabander/olsr,servalproject/olsr,diogomg/olsrd-binary-heap,zioproto/olsrd,duydb2/olsr,zioproto/olsrd,ralisi/olsrd_cl_roam,zioproto/olsrd,diogomg/olsrd-binary-heap,cl4u2/olsrd-wot-pgp,duydb2/olsr,sauloqueiroz/incremental-spf