fix ebsp beauti bug #168

[walterxie]

Fix #168

Simply add factor.t:$(n) to handle multiple partitions.

                <distribution id="ExtendedBayesianSkyline.t:X" spec="Coalescent">
                    <populationModel id="scaledDemo.t:X" spec="beast.base.spec.evolution.tree.coalescent.ScaledPopulationFunction">
                        <population id="demographic.alltrees" spec="beast.base.spec.evolution.tree.coalescent.CompoundPopulationFunction" populationIndicators="@indicators.alltrees" populationSizes="@popSizes.alltrees">
                            <itree id="treeIntervals.t:X" spec="beast.base.evolution.tree.TreeIntervals" tree="@Tree.t:X"/>
                            <itree id="treeIntervals.t:mt" spec="beast.base.evolution.tree.TreeIntervals" tree="@Tree.t:mt"/>
                            <itree id="treeIntervals.t:nuclear" spec="beast.base.evolution.tree.TreeIntervals" tree="@Tree.t:nuclear"/>
                        </population>
                        <factor id="factor.t:X" spec="beast.base.spec.inference.parameter.RealScalarParam" domain="PositiveReal" estimate="false" value="1.5"/>
                    </populationModel>
                    <treeIntervals idref="treeIntervals.t:X"/>
                </distribution>
                <distribution id="ExtendedBayesianSkyline.t:mt" spec="Coalescent" treeIntervals="@treeIntervals.t:mt">
                    <populationModel id="scaledDemo.t:mt" spec="beast.base.spec.evolution.tree.coalescent.ScaledPopulationFunction" population="@demographic.alltrees">
                        <factor id="factor.t:mt" spec="beast.base.spec.inference.parameter.RealScalarParam" domain="PositiveReal" estimate="false" value="0.5"/>
                    </populationModel>
                </distribution>
                <distribution id="ExtendedBayesianSkyline.t:nuclear" spec="Coalescent" treeIntervals="@treeIntervals.t:nuclear">
                    <populationModel id="scaledDemo.t:nuclear" spec="beast.base.spec.evolution.tree.coalescent.ScaledPopulationFunction" population="@demographic.alltrees">
                        <factor id="factor.t:nuclear" spec="beast.base.spec.inference.parameter.RealScalarParam" domain="PositiveReal" estimate="false" value="2.0"/>
                    </populationModel>
                </distribution>