Bug 27656: misc/cronjobs/longoverdue.pl better error message

Bug 27656: misc/cronjobs/longoverdue.pl better error message

There are two ways of configuring misc/cronjobs/longoverdue.pl :
use --lost arg or system preferencies DefaultLongOverdueLostValue and DefaultLongOverdueDays.

Actually if you don't use any of it, you get a message :
  "ERROR: No --lost (-l) option defined"
Should also say something about preferencies :
  "ERROR: No --lost (-l) option no system preferences DefaultLongOverdueLostValue/DefaultLongOverdueDays defined"

Test plan:
1) Set empty preferences DefaultLongOverdueLostValue and DefaultLongOverdueDays
2) Run : misc/cronjobs/longoverdue.pl --maxdays 365
3) You see error message
4) Set DefaultLongOverdueLostValue = 1 and DefaultLongOverdueDays = 90
5) Run : misc/cronjobs/longoverdue.pl --maxdays 365
6) You don't see error message

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>