Version 0.9.5				2025/4
 * Fixed a bug that xdvfftex, xdvifftex, xdvrfftex and xdvirfftex cause
   segmentation fault when the batch is more than 2.
 * Implemented FFT of non-power-of-two (the specification is that
   the minus order given as the function argument is interpreted as the FFT point).
 * Added some functions related to sp?Vectors.
 * Added copy functions of ?vrcopyr, ?vicopyi that enable real-to-real copy
   or imaginary-to-imaginary copy.
 * Fixed a bug of rffttofft(f) and ffttorfft(f).
 * Added some functions to fileio.h.
 * Implemented functions for the CQT (constant-Q transform) analysis (beta version).

Version 0.9.4-4				2022/5
 * Fixed a bug that ?vinit and x?vinit do not work in creating a descending vector.
 * Improved the compatibility of xdvresample with MATLAB's resample.
 * Fixed a bug that spResampleProcess sometimes doesn't work.

Version 0.9.4-3				2018/11
 * Fixed a bug that ?vunset sometimes frees an allocated memory twice.
 
Version 0.9.4-2				2017/4
 * Added `const' qualifier to some function arguments and return values.

Version 0.9.4				2016/10
 * Fixed a bug that x?mmakediag cannot get imaginary part.
 * Added some functions and changed specifications of LPC.
 * Added some functions of vector and matrix such as norm.
 * Fixed some bugs of ?minums and ?mizeros.
 * Fixed a bug that dvlusolve sometimes crashes.
 * Fixed a bug that ?vadd doesn't work when x_offset is negative.
 * Updated example projects of Android so that the latest Android Studio can
   build them.
 
Version 0.9.3-2				2016/4
 * Implemented some buffer overflow protection on Windows, Linux, etc.

Version 0.9.3				2015/12
 * Added and modified some functions related to matrix.

Version 0.9.2 (private release)		2015/11
 * Added some functions related to vector and matrix.
 * Fixed bugs related to vector and matrix.
 * Fixed a bug that dvwriteaudiofile and dvwriteaudiofileex do not work properly.

Version 0.9.1 (private release)		2014/9
 * Fixed a bug that some parameters of kaiser windows is wrong.
 * Changed specification of fir1 function.
 * Fixed a bug and implemented inplace I/O of rffttofft and ffttorfft.
 * Added some functions.

Version 0.9.0				2012/8
 * Added some functions.

Version 0.8.11				2010/12
 * Implemented xdvmelwarp function which converts cepstrum into mel-cepstrum.
 * Implemented plugin-based vector calculation (unofficial).

Version 0.8.10				2010/8
 * Fixed a bug that x?vimage takes the real part instead of the imaginary part.
 * Implemented ?vsshift functions which enables data shifting for Vectors.

Version 0.8.9				2008/11
 * Fixed a bug of buffer overflow in the fftshift function.

Version 0.8.8				2008/7
 * Added some functions to fft.c.

Version 0.8.7				2007/12
 * Added some functions to filter.c and matrix.c.

Version 0.8.6				2006/6/27
 * Added some functions to fft.c.

Version 0.8.5				2005/3/8
 * Implemeted quick FFT processing using Intel SPL (Windows) or vecLib (Mac).
 * Implemented PICOLA (speech time expansion) related functions.

Version 0.8.4				2003/12/18
 * Added some functions to fileio.c and fft.c.

Version 0.8.3				2000/10/8
 * Changed some functions of fft.c and sfconv.c.

Version 0.8.2				2000/7/17
 * Added some functions to fft.c.

Version 0.8.1				1999/8/27
 * Added some functions.
