Fix problem with const qualifiers on function return types.

The CMake version 3.13.4 has a problem to cut the length of test results
to be uploaded to CDash. Using CMake 3.19.1 fixes the problem.

Eoin Clerkin authored Dec 02, 2020 and Florian Uhlig committed Dec 02, 2020

Adds updated geometry repository tag to be synced by cmake.

With CMake versions >= 3.14.0 is is possible to extract the buildid
when submitting results to CDash. This allows to construct the proper
URL to the results on CDash and display it at the end of the CTest script.

Load a single library to check if there is some dependency missing.

Pascal Raisig authored Dec 01, 2020 and Volker Friese committed Dec 01, 2020

A helper function was added to retrieve the elink number of a given channel
number in the module coordinate system