lunar-install: fixes #6 - sane button labels for mount point dialog
stage2: abort properly on module errors

xargs will just ignore module errors and continue on to the next thus
making it really hard to find the actual problem.

Lend resolv.conf from the host, since a couple of modules clear ithe download cache
after lin, to allow re-downloade from within the chroot.
Adding cryptsetup to livecd
Exclude grub from the iso since grub2 conflicts with it