Moved gpl3.txt back to the doc directory, and included the doc directory in the binary distribution. Included new MAC installation data.

--
user: Michael Guravage <michael.guravage@cwi.nl>
branch 'default'
added doc/gpl3.txt
added src/VirtualLeaf-install-macosx/01virtualleaf-contents.xml
added src/VirtualLeaf-install-macosx/01virtualleaf.xml
added src/VirtualLeaf-install-macosx/02models-contents.xml
added src/VirtualLeaf-install-macosx/02models.xml
added src/VirtualLeaf-install-macosx/03leaves-contents.xml
added src/VirtualLeaf-install-macosx/03leaves.xml
added src/VirtualLeaf-install-macosx/index.xml
changed .hgignore
changed NEWS
changed src/ChangeLog
changed src/VirtualLeaf-install.nsi
changed src/canvas.cpp
removed ChangeLog
removed src/gpl3.txt
removed src/vleafmacosx_installer.pmdoc/01virtualleaf-contents.xml
removed src/vleafmacosx_installer.pmdoc/01virtualleaf.xml
removed src/vleafmacosx_installer.pmdoc/02models-contents.xml
removed src/vleafmacosx_installer.pmdoc/02models.xml
removed src/vleafmacosx_installer.pmdoc/03leaves-contents.xml
removed src/vleafmacosx_installer.pmdoc/03leaves.xml
removed src/vleafmacosx_installer.pmdoc/index.xml