Log when an option is implicitly taken from the environment
Log when an option is implicitly taken from the environment

Since that can be confusing if it was not intended. GH #2015

randombit/botan,webmaster128/botan,webmaster128/botan,webmaster128/botan,webmaster128/botan,randombit/botan,webmaster128/botan,randombit/botan,randombit/botan,randombit/botan