fft/spgram: moving object declaration to macro
fft/spgram: moving internal object definition to macro
fft/spgram: adding spgramf object (real inputs) and example
Merge branch 'master' of callisto/git/liquid-dsp
agc/build: fixing trivial typo, formatting
Merge remote-tracking branch 'origin/master'
fft/asgram: moving internal object definition to macro
fft/asgram: adding 'print' method for API simplicity
fft/spgram: fixing bug with output array size in execute()
fft/asgram: adding real-valued ascii spectrogram example
fft/asgram: cleaning up examples descriptions
fft/spgram/asgram: separating push() from write() methods

  * now both spgram and asgram families have both push() and write()
  * push() allows single sample to be written internally
  * write() allows a block of samples to be written
  * promotes more functionality and flexibility to specific designs
fft/spgram: adding simple method to convert to dB with FFT shift
Merge branch 'master' of liquidsdr/liquid-dsp
fft/spgram: fixing fftshift bug with execute_psd()
fft/spgram: adding simple weighting factor for PSD estimate

  * average power spectral density estimate (smoothing)
  * simple auto-regressive filter
  * calibrated to known PSD input