switch to Ubuntu 16.04 base box
switch to Ubuntu 16.04 base box

the new CartoOSM style needs a library that was only added as a
package in this version

unfortunately Ubuntu changed the way the base box for Virtualbox
is built:

* using SATA/IDE storage adapter no longer works, SCSI adapter needs
  to be used (not a big thing in the end, but tricky to figure out
  what went wrong and what new options to use)

* base image FS is smaller now (10GB instead of 20GB) so we need
  to put /home/maposmatic/* on the extra virtual disk, too

hholzgra/maposmatic-vagrant,hholzgra/maposmatic-vagrant,hholzgra/maposmatic-vagrant,hholzgra/maposmatic-vagrant