Implementation of NFC-HOA

First Version of 25D NFC-HOA virtual point source

Bugfixing and NFC-HOA 25D plane wave

Fixed direction of plane wave in 25D NFC-HOA and implemented plane wave in 2D NFC-HOA

Added NFC-HOA examples

Edits

Increased number of secondary sources in circular examples

Fixed bug
Implementation of sound figures

Fixed bug due to sign of DFT/FFT

Example soundfigure

Fixed some bugs

Optimized example, plotting without normalization

Reorganized examples

Various changes

Cleaned code of example, script for animation of sound field

Example for christmas
Merge branch 'soundfigures' of https://github.com/sfstoolbox/sfs-python into soundfigures