Rsync3 mac os update

Rsync 3 update on Mac OS X

sources:

• http://www.bombich.com/rsync.html
• http://www.whoopis.com/howtos/rsync-hfs-howto/
• https://discussions.apple.com/thread/2324215

This should the complete definition of the quadrupole moment:
[ Q_{\alpha, \beta} = \sum_{i=1}^{n.chg} q^{(i)}(3*r_{\alpha}^{(i)}*r_{\beta}^{(i)} - r^{(i)}r^{(i)}\delta_{\alpha, \beta}) ]

where ( \alpha ) and ( \beta ) are the cartesian axis ( x, y, z ); ( i ) is an iterator over charges, and ( r_{\alpha} ) is the position-vector component of charge ( q^{(i)} ).