This helps us avoid the issues when disk changes from sda to hda

it gives error messages in case syslinux.cfg is not there.

and make it possible to override the email address

we create /boot, swap and / by default
using -r will create raid1 devices with a single disk.

fixes http://redmine.alpinelinux.org/issues/show/94

Package no longer exist

we mignt want boot from usb disks in raid for example...

and strip trailing / from mounted partition

nangel helped me with this one