Importing usr.bin/who
Importing usr.bin/yes

Change-Id: Ia76d7ce9c6b2bf7523d2ecbc6470e3e1e7ab5ee5
Importing usr.bin/cal
WIP: add PCI device support

Rebased patch, original work done by Jorn van Engelen
Original diff can be found from:
  http://ftp.quzart.com/minix/modular-xorg-server/2011.04.15_16.37/minix.src_pci-dev_2011.04.15_16.37.30.diff