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and fix help to include LVM option
ref #592

for dynamic dns

The interfaces should come in order the user configures them and put
lo first of all.

It makes more sense to talk about a system disk and data disk.

We only want fiddle with MBR if we use new disks and not if we install
on a mounted root

So we dont need to ask.

Also fix help message.

If you run 'setup-disk /dev/sda /dev/sdb ...' then automatically set
up raid, even if no -r option was specified. If more than 2 disks
are specified then use raid5, otherwise use raid1.

ask first what disk to use, and then after how to use it.

ref #558

And initial work for data-only disk support.

This reverts commit a04a2d18.

code is a bit messy. needs a cleanup. but its a start.

We check if its shared with previous file. If it is, we try create
a hardlink or we clone it. This should work in most cases.

We need to fix it first.

- ask for timezone after root password (before we start syslog)
- rephrase the questinos and fix input prompt to be on same line

- use alpine version from /etc/alpine-release
- dont ask for testing repo, but just add it commented
- give user option to edit file manually
- give user opptortunity to add several mirrors
- first time default is 'detect fastest', second default is 'done'
- only update apk index if anything changed