Toolbar icons (in toolbar/ subdirectory) are from the Tango project
(http://tango.freedesktop.org) and are released under Creative Commons
Attribution Share-Alike license
(http://creativecommons.org/licenses/by-sa/2.5/).

wxMaxima icons (wxmac.icns, maximaicon.ico, wxmaxima.png) were created
by Sven Hodapp (http://4pple.de) and are under GPL.
