Use std::abs, ddsim logging of sensitive detectors

[andresailer]

BEGINRELEASENOTES

• NestedBoxReflection_geo.cpp: use std::abs instead of abs
• HexGrid: use std::abs instead of abs
• DDSim: better logging of which sensitive detector is used when defaults are used

ENDRELEASENOTES

@sebouh137
Could you confirm that the abs in HexGrid is the one for floats?
As we had an issue #1192, where the abs changed, it is better to use std::abs explicitly everywhere.

[github-actions]

Test Results

       6 files         6 suites   7h 16m 59s ⏱️
   356 tests    356 ✔️ 0 💤 0 ❌
1 058 runs  1 058 ✔️ 0 💤 0 ❌

Results for commit fbbbdef.

♻️ This comment has been updated with latest results.