bug fix for production phase average energy, updated example

1. average energy ignored initial energy read from restart file, now fixed
2. error bars of guest-guest Ewald summation is getting 0.000 due to typo (!) in maths.cuh, now fixed
3. restart examples for both reading LAMMPS data file and RASPA-2 restart file are updated with 100K + 100K MC steps, averaged energies and error bars are verified and correct now

Author: Zhaoli2042

Examples/Restart-Examples/Read-LAMMPS/simulation.input

@@ -1,6 +1,6 @@
-NumberOfInitializationCycles 0
+NumberOfInitializationCycles 100000
 NumberOfEquilibrationCycles  0
-NumberOfProductionCycles     0
+NumberOfProductionCycles     100000
 
 UseMaxStep  yes
 MaxStepPerCycle 1
@@ -49,4 +49,3 @@ Component 0 MoleculeName             TIP4P
             TMMCMax 22
             UpdateTMMCEvery 1000000
             CreateNumberOfMolecules  0
-