+ Adds first implementation for the Acquisition interface, split into
Controller and Channel Modules
+ frappy_demo: adds an example simulation
+ new property AttachedDict for a collection of attached modules
+ move Attach and AttachDict to a new file frappy/attached.py
+ interface_classes creation changed. includes now also Acquisition
Change-Id: I198a96065a65bb28f73e468ce0465fca2d8734d7
