Remove the notion of "sys*"

- This idea originates from very early in the project and was, at the
  time, a very easy way to categorise things.
- Now, it doesn't really make much sense - it is fairly arbitary, often
  occuring when there is a change in kernel, but not from builder-hex0
  to fiwix, and sysb is in reality completely unnecessary.
- In short, the sys* stuff is a bit of a mess that makes the project
  more difficult to understand.
- This puts everything down into one folder and has a manifest file that
  is used to generate the build scripts on the fly rather than using
  coded scripts.
- This is created in the "seed" stage.

stage0-posix -- (calls) --> seed -- (generates) --> main steps

Alongside this change there are a variety of other smaller fixups to the
general structure of the live-bootstrap rootfs.

- Creating a rootfs has become much simpler and is defined as code in
  go.sh. The new structure, for an about-to-be booted system, is

/
-- /steps (direct copy of steps/)
-- /distfiles (direct copy of distfiles/)
-- all files from seed/*
-- all files from seed/stage0-posix/*

- There is no longer such a thing as /usr/include/musl, this didn't
  really make any sense, as musl is the final libc used. Rather, to
  separate musl and mes, we have /usr/include/mes, which is much easier
  to work with.
- This also makes mes easier to blow away later.
- A few things that weren't properly in packages have been changed;
  checksum-transcriber, simple-patch, kexec-fiwix have all been given
  fully qualified package names.
- Highly breaking change, scripts now exist in their package directory
  but NOT WITH THE packagename.sh. Rather, they use pass1.sh, pass2.sh,
  etc. This avoids manual definition of passes.
  - Ditto with patches; default directory is patches, but then any patch
    series specific to a pass are named patches-passX.

steps/jump/fiwix.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+set -ex
+
+# Build the ext2 image
+make_fiwix_initrd
+
+# Boot Fiwix
+kexec-fiwix

steps/jump/linux.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+. /steps/bootstrap.cfg
+
+set -e
+
+# Perform the actual kexec
+if [ "${KERNEL_BOOTSTRAP}" = True ]; then
+    sync
+    # We don't use the gen_initramfs_list.sh script because it is so *SLOW*
+    # This emulates the same thing it does
+    find / -xdev -type d -printf "dir %p %m %U %G\n" >> /initramfs.list
+    find / -xdev -type f -printf "file %p %p %m %U %G\n" >> /initramfs.list
+    find / -xdev -type l -printf "slink %p %l %m %U %G\n" >> /initramfs.list
+    find / -xdev -type c -or -type b -not -name "ram*" -printf "nod %p %m %U %G %y " -exec stat -c '%Hr %Lr' {} \; >> /initramfs.list
+    kexec-linux "/dev/ram1" "/boot/linux-4.9.10" "!$(command -v gen_init_cpio) /initramfs.list"
+else
+    mkdir /etc
+    # kexec time
+    if [ "${BARE_METAL}" = True ]; then
+        kexec -l "/boot/linux-4.9.10" \
+            --append="root=/dev/sda1 rootfstype=ext3 init=/init rw"
+    else
+        kexec -l "/boot/linux-4.9.10" --console-serial \
+            --append="console=ttyS0 root=/dev/sda1 rootfstype=ext3 init=/init rw"
+    fi
+    kexec -e
+fi

steps/jump/move_disk.sh

@@ -0,0 +1,27 @@
+#!/bin/sh
+
+set -ex
+
+# Create partition if it doesn't exist
+if [ $(($(stat -c "%Lr" "/dev/${DISK}") % 8)) -eq 0 ]; then
+    echo "Creating partition table..."
+    echo ";" | sfdisk "/dev/${DISK}"
+    fdisk -l "/dev/${DISK}"
+    echo "Creating ext4 partition..."
+    mkfs.ext4 "/dev/${DISK}1"
+    DISK="${DISK}1"
+fi
+
+# Mount the partition, move everything into /external
+mkdir -p /newroot
+mount -t ext4 "/dev/${DISK}" /newroot
+mkdir -p /newroot/external
+mv /newroot/* /newroot/external/ 2>/dev/null || true # obviously errors trying to move external into itself
+
+# Switch root
+mkdir -p /rootonly
+# This doesn't recursively mount - that's why we're able to copy everything over
+mount --bind / /rootonly
+cp -ar /rootonly/* /newroot/
+umount /rootonly
+switch_root /newroot /init