Missing a function to set bits per sample of a SignalSource and a bug in WaveFileHandler

[sangk54]

1. A SignalSource always returns getBitsPerSample = 64 bits. To save to wav file, bps is set to 16bit, I can't save to wave file with 8 bits per sample. I think that class SignalSource should have a property bps and its gettter, setter.
2. A bug in function readHeaderAndChannels() of class WaveFileHandler
   short* data = new short[header.WaveSize/2];
   fs.read((char_)data, header.WaveSize);
   Ex header.WaveSize = 5, data was allocated with 4 bytes but filled with 5 bytes (from fs.read)
   delete [] data; can crash ( always crash in Visual C++ 2012 (win 64bit))
   Simple fix: short_ data = new short[header.WaveSize/2 + 1];