Merge branch 'apearce-prescaler-seed-property' into 'master'

Set prescaler seed with explicit property

See merge request !370

DaVinciTests/tests/options/DVTestWriteDst.py

@@ -52,6 +52,7 @@ for i in MassRanges :
 
     # define the prescale to have a constant (assumed flat) level of background
     prescale = DeterministicPrescaler("Prescale_"+name,
+                                      SeedName="Prescale_"+name,
                                       AcceptFraction = 100./(hm-lm))
     filter   = FilterDesktop("Jpsi_"+name,
                              Code = "(MM>"+ln+") & (MM<"+hn+") & (MIPCHI2DV(PRIMARY) > 2)")