initial working commits for deb-build infrastructure

Changes:
- Drop woof-distro and replace with my own.
- Drop merge2out and change with setup.sh
- deb-build and build-iso
- initrd changes: 
--- always assume aufs except when told otherwise
--- always use devtmpfs
--- copy DISTRO_SPECS to pup_new
- rootfs changes: pinstall.sh, rc.sysinit - always use devtmpfs

```sh
grep -q 'devtmpfs' /proc/filesystems && FLAG=1 || FLAG=
```