Add di-tau to DAOD_PHYS

Hello,

This MR adds the low-pt and high-pt di-tau objects to DAOD_PHYS (ATLASG-1502). High-pt di-taus are already part of the standard reconstruction, while low-pt di-tau reconstruction needs to be scheduled explicitly in R21 (it has been added to TauCommon). We have added smart slimming lists for low- and high-pt di-taus which include all Aux variables at the moment, to be refined soon. The DAOD_PHYS structure had to be slightly reshuffled, because the low-pt ditau reconstruction relies on AntiKt2PV0TrackJets, so the the "Jet/MET" block needs to be scheduled before the low-pt di-tau reconstruction and track thinning.

Cheers, Bertrand

Output size (from MC ART tests) with di-tau:

================================================================================
         Categorized data
================================================================================
     Disk Size         Fraction    Category Name
--------------------------------------------------------------------------------
       1.581 kb        0.040       tau
       2.793 kb        0.071       InDet
      39.243 kb        1.000       Total

and prior to this MR:

================================================================================
     Disk Size         Fraction    Category Name
--------------------------------------------------------------------------------
       1.238 kb        0.033       tau
       2.070 kb        0.054       InDet
      38.087 kb        1.000       Total