48897dfeb9
warnings before attempting a mount. (longopts): Add no-executable option. (mount_commands): Ditto. (opts): Ditto. (usage): Ditto. Indicate that system mount is now the default. (main): Accommodate no-executable option. Make system mount the default. * umount.cc (usage): Indicate that system umount is now the default. (main): Make system umount the default.