Added pythia8 configs for heavy-ions (#49)

Author: preghenella

examples/pythia8/pythia8_OO.cfg

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+### main
+Main:numberOfEvents 1000
+
+### beams
+Beams:idA 1000080160		# O
+Beams:idB 1000080160		# O
+Beams:eCM 7000. 		# GeV
+
+### heavy-ion settings (valid for O-O 7000)
+HeavyIon:SigFitNGen = 0
+HeavyIon:SigFitDefPar = 14.30,1.87,0.23,0.0,0.0,0.0,0.0,0.0
+#HeavyIon::6.72
+
+### processes (apparently not to be defined)
+
+### decays
+ParticleDecays:limitTau0 off
+ParticleDecays:tau0Max = 10

examples/pythia8/pythia8_PbPb.cfg

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+### main
+Main:numberOfEvents 100
+
+### beams
+Beams:idA 1000822080		# Pb
+Beams:idB 1000822080		# Pb
+Beams:eCM 5520. 		# GeV
+
+### heavy-ion settings (valid for Pb-Pb 5520 only)
+#HeavyIon:SigFitNGen = 0
+#HeavyIon:SigFitDefPar = 15.01,1.88,0.24,0.0,0.0,0.0,0.0,0.0
+#HeavyIon:bWidth	8.83
+
+### processes (apparently not to be defined)
+
+### decays
+ParticleDecays:limitTau0 off
+ParticleDecays:tau0Max = 10

examples/pythia8/pythia8_XeXe.cfg

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+### main
+Main:numberOfEvents 100
+
+### beams
+Beams:idA 1000541290		# Xe
+Beams:idB 1000541290		# Xe
+Beams:eCM 5860. 		# GeV
+
+### heavy-ion settings (valid for Xe-Xe 5860 only)
+#HeavyIon:SigFitNGen = 0
+#HeavyIon:SigFitDefPar = 
+#HeavyIon:bWidth = 
+
+### processes (apparently not to be defined)
+
+### decays
+ParticleDecays:limitTau0 off
+ParticleDecays:tau0Max = 10