Thanks to Shuang for reporting.

Was not used anymore and is replaced by gltf format (in ParaView).

Had to make some modifications to iphreeqc:

https://github.com/ufz/iphreeqc/commit/b1047d3eb03e7ef1b850231be35acb9c6a2cf345

Was not in use anymore.

Submodule commit b0bc24cfdda39b30145b1f6c2c84b801cd131fef was not available anymore in the master branch of ArashPartow/exprtk.
The branch was maybe rebased? Used commit c7c219480d9678eec7383a4a99030683c4a84d91 instead (same commit date).

... instead of deprecated result_of.

pybind11 2.6.1.
spdlog 1.8.2

autocheck and googletest to latest main branches.