[FEATURE] Add Host Interface IP-Core V0.0.1 for Altera FPGA

This is the host interface ipcore to be used for Altera Qsys implementation.
This component supports Avalon host interfacing at the moment.

Change-Id: I82eb3eca6aa30e1a56348bb019b52a2527f1e425
Reviewed-on: http://brateggevoat1/gerrit/568
Tested-by: Jenkins <jenkins@brateggevoat1.br-automation.co.at>
Reviewed-by: Joerg Zelenka <joerg.zelenka@br-automation.com>
Reviewed-by: Josef Baumgartner <josef.baumgartner@br-automation.com>
[FEATURE] Add Terasic DE2-115 MN dual Nios II board example

This POWERLINK MN demo is built with Altera Quartus 12.0 and Qsys.
It provides two Nios II CPUs which are connected through the Host Interface
IP-Core. Furthermore a large Signal Tap instance is includes for benchmarking
and debugging purpose.

Change-Id: Ibd15801897427cd228fdb32ed241278e47777d3b
Reviewed-on: http://brateggevoat1/gerrit/569
Tested-by: Jenkins <jenkins@brateggevoat1.br-automation.co.at>
Reviewed-by: Joerg Zelenka <joerg.zelenka@br-automation.com>
Reviewed-by: Josef Baumgartner <josef.baumgartner@br-automation.com>
[FEATURE] Add Host Interface IP-Core SW library

This is the SW library for the Host Interface IP-Core, supporting only
Altera Nios II platform at the moment.
The library includes low-level drivers (*_l.*), software modules for
linear memory buffers (linmem.*) and a lock-free queue implementation
(lfqueue.*).

Change-Id: Icf916df217fa3027450153de325e1d2e28ef0d06
Reviewed-on: http://brateggevoat1/gerrit/572
Tested-by: Jenkins <jenkins@brateggevoat1.br-automation.co.at>
Reviewed-by: Josef Baumgartner <josef.baumgartner@br-automation.com>
[FEATURE] Add Host Interface IP-Core CAL interface

This introduces a CAL implementation that uses the Host Interface IP-Core.
This CAL provides simple shared memory (linmem) and also lock-free queues
(lfqueue). Furthermore the MMU ability is implemented in the CTRL module to
access the initialization parameters in Pcp memory environment from the host.

Change-Id: I82467b10a9267bf4af4a9e42d1b1b4114efaf524
Reviewed-on: http://brateggevoat1/gerrit/573
Tested-by: Jenkins <jenkins@brateggevoat1.br-automation.co.at>
Reviewed-by: Josef Baumgartner <josef.baumgartner@br-automation.com>