Implement original format data recording as record engine

Builds/Linux/Makefile

Builds/MacOSX/open-ephys.xcodeproj/project.pbxproj

Builds/VisualStudio2012/open-ephys.vcxproj

Source/MainWindow.cpp

Source/Processors/Channel.cpp

Source/Processors/OriginalRecording.cpp

Source/Processors/OriginalRecording.h

Source/Processors/ProcessorGraph.cpp

Source/Processors/RecordEngine.cpp

Source/Processors/RecordEngine.h

Source/Processors/RecordNode.cpp

Source/Processors/RecordNode.h

Source/Processors/SpikeDisplayNode.cpp

Source/Processors/Utilities/RecordControl.cpp

open-ephys.jucer