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tauRecTools: associate cluster in CaloCalTopoClusterContainer to the tau candidate

Xiaozhong Huang requested to merge xiaozhon/athena:ref into master

For Topo seed jets, the cluster links in the tau candidate point to the clusters in a shallow copy container, which will not be available in AOD of R22. To fix this, the cluster links point to the cluster in the original container.

For PFlow seed jets, the cluster links in the tau candidate point to the PFOs(neutral or charged). It is confusing. Now the cluster links point to the corresponding cluter in the PFO object.

Previously, only clusters within 0.2 cone of tau candidate is stored. In the tau reconstruction, we need all the clusters. Thus the cut of dR is now removed.

The clusters could have energy <=0, which will be skimmed in AOD. The link then becomes invalid. Since we do not want an invalid link, all the clusters are requied to have positive energy.

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