Merge pull request #4 from skristiansson/for-julius

fixes related to running the cycle accurate simulator
pronto with tcm: updates to toplevel
sysc modules: permit CPU path specification via define
pronto with tcm: specify path to CPU module for sysc model
Merge pull request #5 from skristiansson/for-julius

add de0_nano board
gpio: add modified OpenCores GPIO module

Add software driver and basic test.

Update SystemC ORPSoC top instantiation to support it.

Instantiate in mor1kx-prontoespresso build.
gpio: fix driver for builds without GPIO
mor1kx-prontoespresso: add arbiters left out of GPIO commit
cappuccino: add mor1k-version, or1k-ov and or1k-csimple to testlist
include unistd.h to avoid fatal gcc warnings

functions like pipe, read, write etc needs this
add or1k-regjmp test

this test does a series of jump to registers with a slight
variation between the l.jalr that sets the link register
and the l.jr r9 that use the link register.