SFS Toolbox 2.2.1

Bug fix release including improvements for the delayline, convolution and linear interpolation capabilities of the toolbox. For documentation of the SFS Toolbox, see http://matlab.sfstoolbox.org/.

NEWS:

- fix delayoffset for FIR fractional delay filter
- add findconvexcone()
- simplify convolution()
- add linear interpolation working in the frequency domain
- fix pm option for delayline()