Merge branch 'nd/remove-ignore-env-field'

Code clean-up for the "repository" abstraction. * nd/remove-ignore-env-field: repository.h: add comment and clarify repo_set_gitdir repository: delete ignore_env member sha1_file.c: move delayed getenv(altdb) back to setup_git_env() repository.c: delete dead functions repository.c: move env-related setup code back to environment.c repository: initialize the_repository in main()