antialiasing of channel images

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@7572 b45a01b8-16f6-495d-af2f-9b41ad6348cc
Big progress for People dialog. Phenom work.

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@7573 b45a01b8-16f6-495d-af2f-9b41ad6348cc