Merge pull request #23 from pthedinger/multi_stream_example

Fixing bugs needed for existing stream discovery
Adding back <string.h> include accidentally removed
Change max listener channels back to 8 to prevent crash
Changes to support D4U target in app
Adding configuration option to change function of PLL AUX out
Forgot to commit PLL config changes
Merge branch 'master' into multi_stream_example
Incorporating changes to simple app for multi stream support
Removing multi streams app

Supported now in the simple app
Changes to compile with talker/listener disabled
Fix compile error if 1722.1 disabled
Only enabled MAAP if Talker is enabled
Fixing compile error when #f conditional is enabled
Moving ENABLE_XSCOPE from Makefile into board support header
Forgot to include the avb_conf in the XScope file
Renaming heading to Design Guide
updated links to xmos.com boards
Merge pull request #24 from huwg59/patch-3

updated links to xmos.com boards
Update CHANGELOG and xpd dependancies
Updating project files