Merge branch 'js/safe-directory-plus'

Platform-specific code that determines if a directory is OK to use as a repository has been taught to report more details, especially on Windows. * js/safe-directory-plus: mingw: handle a file owned by the Administrators group correctly mingw: be more informative when ownership check fails on FAT32 mingw: provide details about unsafe directories' ownership setup: prepare for more detailed "dubious ownership" messages setup: fix some formatting