Fixing up inclusion of functions while allowing local usage of live-build with different file layouts.

This package list has had a spelling typo since its initial
commit. Nobody has ever reported that and the official
live-build package in ubuntu does not ship these lists either.
Apparently nobody uses them, so we can remove them to improve
quantity/quality ratio.

Removing losetup-lukshome.chroot example hook, obsoleted by live-boots new persistence implementation.

Removing okular-nodrm.chroot example hook, would need update for recent kde4 versions and I don't care about that.

Removing debian-installer-banner.binary example hook, this can be done through config/includes.binary_debian-installer directly.