V2.1.0 - New features part 1

Version 2.1.0 of InetVis is the first feature release since the port from Qt 3 was completed.
Noteworthy features include support for building and running the application on Mac OS X,
screenshots in PNG format, a settings file with UI dialog have been introduced,
two new automatic movement modes have been added for visualisation, and new and useful keyboard
shortcuts have been added.

Various other small improvements have also been implemented.