Adding vSPD Override gdx creation

User can use excel interface to create overrides to apply to vSPD run

vSPD_Overrides/excel2gdx.bat

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+cd /D "%~dp0"
+gdxxrw vSPD_Overrides.xlsx output="../Override/vSPD_Overrides" squeeze=n @howtoread.inc
+pause

vSPD_Overrides/gdxviewer.ini

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+[filehistory]
+lastdirectory=C:\vSPD\vSPD_Overrides\Override\
+file1=C:\vSPD\vSPD_Overrides\Override\TestOverridesHowtoRead.gdx
+file2=
+file3=
+file4=
+file5=
+
+[specialvaluemapping]
+inf=INF
+minf=-INF
+eps=EPS
+na=NA
+undf=UNDF
+
+[textfileexport]
+columnseparator=0
+append=0
+
+[CSVfileexport]
+indexquotes=1
+specialvaluequotes=0
+
+[export]
+indices=1
+lowerbounds=1
+levels=1
+upperbounds=1
+marginals=1
+
+[XLSfileexport]
+backup=1
+newspreadsheet=0
+
+[MDBfileexport]
+indexlength=31
+importmethod=0
+
+[HTMLexport]
+tableborder=0
+tablepadding=0
+tablespacing=0
+
+[XMLexport]
+roottag=gams
+recordtag=record
+parametervaluetag=value
+lotag=lo
+leveltag=level
+uptag=up
+marginaltag=marginal
+dim1tag=dim1
+dim2tag=dim2
+dim3tag=dim3
+dim4tag=dim4
+dim5tag=dim5
+dim6tag=dim6
+dim7tag=dim7
+dim8tag=dim8
+dim9tag=dim9
+dim10tag=dim10
+
+[SQL]
+connectionstring=
+userid=
+password=
+indexlength=31
+doubletype=double
+
+[SQLINSERT]
+dbcol1=
+dbcol2=
+dbcol3=
+dbcol4=
+dbcol5=
+dbcol6=
+dbcol7=
+dbcol8=
+dbcol9=
+dbcol10=
+dbcol11=
+dbcol12=
+gdxcol1=-1
+gdxcol2=-1
+gdxcol3=-1
+gdxcol4=-1
+gdxcol5=-1
+gdxcol6=-1
+gdxcol7=-1
+gdxcol8=-1
+gdxcol9=-1
+gdxcol10=-1
+gdxcol11=-1
+gdxcol12=-1
+quotecol1=0
+quotecol2=0
+quotecol3=0
+quotecol4=0
+quotecol5=0
+quotecol6=0
+quotecol7=0
+quotecol8=0
+quotecol9=0
+quotecol10=0
+quotecol11=0
+quotecol12=0
+tablename=
+semicolon=1
+
+[SQLUPDATE]
+dbcol1=
+dbcol2=
+dbcol3=
+dbcol4=
+dbcol5=
+dbcol6=
+dbcol7=
+dbcol8=
+dbcol9=
+dbcol10=
+dbcol11=
+dbcol12=
+gdxcol1=-1
+gdxcol2=-1
+gdxcol3=-1
+gdxcol4=-1
+gdxcol5=-1
+gdxcol6=-1
+gdxcol7=-1
+gdxcol8=-1
+gdxcol9=-1
+gdxcol10=-1
+gdxcol11=-1
+gdxcol12=-1
+quotecol1=0
+quotecol2=0
+quotecol3=0
+quotecol4=0
+quotecol5=0
+quotecol6=0
+quotecol7=0
+quotecol8=0
+quotecol9=0
+quotecol10=0
+quotecol11=0
+quotecol12=0
+tablename=
+semicolon=1
+
+[SQLServer]
+server=
+database=
+userid=
+password=
+insertmethod=0
+indexlength=31
+
+[listfont]
+name=MS Sans Serif
+charset=1
+color=-16777208
+size=12
+style=0
+

vSPD_Overrides/howtoread.inc

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+par=demand_overrides rng=NodeDemandOvrd!A2 rDim=4 
+
+par=offer_parameter_overrides rng=OfferParameterOvrd!A2 rDim=3 
+
+par=energy_offer_overrides rng=EnergyOfferOvrd!A2 rDim=4 
+
+par=reserve_offer_overrides rng=ReserveOfferOvrd!A2 rDim=6
+
+par=bid_parameter_overrides rng=BidParameterOvrd!A2 rDim=3
+
+par=energy_bid_overrides rng=EnergyBidOvrd!A2 rDim=4 
+
+par=branch_parameter_overrides rng=BranchParameterOvrd!A2 rDim=3 
+
+par=branch_constraint_overrides rng=BranchConstraintOvrd!A2 rDim=3 
+
+par=branch_cnstr_factor_overrides rng=BranchConstraintFactorOvrd!A2 rDim=3 
+
+par=marketnode_constraint_overrides rng=MnodeConstraintOvrd!A2 rDim=3 
+
+par=marketnode_cnstr_factor_overrides rng=MnodeConstraintFactorOvrd!A2 rDim=5 
+
+