Add ACPI support.

From the shiny new GPL Plan 9 repo!
ACPI hanging

cat '#a' and watch the kernel lock up. NO ^g, no nothing. dead.

Signed-off-by: Ronald G. Minnich <rminnich@google.com>
ACPI now starts up.

This 'create your own fmt char' stuff is cute, but we're probably
blowing the stack out. It's not worth it, so I made it a
dumpGas
function. Which seems highly appropriate when discussing ACPI.

Signed-off-by: Ronald G. Minnich <rminnich@google.com>
Merge branch 'master' of github.com:brho/akaros into testing