Release 2021.09.11

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From #3482 (Interpolate to center of star on subcell):

The interpolation target tags need interpolating_component to be templated on the metavariables

Merged pull-requests (15)

New features (1):

• Support per-core reductions (#3464)

General changes (12):

• Add StrahlkorperTags::PhysicalCenterCompute. (#3484)
• Upgrade Doxygen in the container (#3483)
• Add spherical harmonic initial data for CurvedScalarWave (#3416)
• Add code to check if functions of time are ready (#3467)
• Add LinkedMessageQueue (#3479)
• Interpolate to center of star on subcell (#3482)
• Add 3d time dependent rotation matrix (#3364)
• Fix superluminal velocities in Kastaun recovery scheme (#3500)
• Add virtual functions to FunctionOfTime base (#3499)
• Add MeasurementTimescales Tag (#3495)
• Add initial data TCI for advection system (#3494)
• Add pybindings for mesh.slices() (#3503)

Bugfixes (2):

• Add domain::Tags::JacobianCompute to docs (#3501)
• Fix doc-coverage with Doxygen 1.9.1 (#3498)

Contributors (8): @markscheel, @nilsleiffischer, @nikwit, @wthrowe, @kidder, @knelli2, @nilsdeppe, @yoonso0-0