generate Debian-7.1.0-amd64-netboot definition
update comments in preseed based on official example

see http://www.debian.org/releases/wheezy/example-preseed.txt
align account setup with example preseed

see http://www.debian.org/releases/wheezy/example-preseed.txt
update keymap settings

should have no effect as we're just using the alias to set the same setting
use default partitioning

see http://www.debian.org/releases/wheezy/example-preseed.txt
simplify directives for boot preseed
add grub comments from default preseed

see http://www.debian.org/releases/stable/amd64/apbs04.html.en
don't install unzip or curl (switch to wget)
removing old vbox GA should not be conditional
use the right package names when removing old vbox GA
remove useless vagrant customization
don't create vagrant user twice

it was already created by preseed
don't install nfs

we're using vbox shared folders
install packages only for vbox

they're not needed elsewhere
no need to install libdbus
add vagrant to sudo group
purge autoremoved packages
don't install chef or ruby
don't install unrequired packages
destroy unused files