improved RSGraph class. Used it for Turtle statistics and bandwidth statistics as well

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@7612 b45a01b8-16f6-495d-af2f-9b41ad6348cc
small fixes in number display

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@7613 b45a01b8-16f6-495d-af2f-9b41ad6348cc