BUG FIX test_singularity_installation(): No longer fails when Apptainer is used instead of Singularity.
MINOR CHANGES run(): Use different environment variables when Singularity is actually Apptainer.
NEW FUNCTIONALITY run_auto_mount(): Added helper function for letting babelwhale figure out which directories to mount automatically (#26, thanks @joelnitta!).
detect_backend(): Print helpful message when neither docker or singularity are installed (Thanks @KforKuma).BUG FIX test_docker_installation(): Use docker info to check whether docker is available.
BUG FIX: Redirect stdout and stderr to files to avoid processx hangs (#24, thanks @joelnitta!).
MINOR CHANGE: Change maintainer from Wouter to Robrecht.
MINOR CHANGE: Added an environment_variables to the singularity and docker config.
set_config_default(): Fixed refactoring error; use saveRDS instead of save.