add back extreme zoom-out levels raise brush radius limit from 150 to 5000
add back extreme zoom-out levels
raise brush radius limit from 150 to 5000

svn:9a0661a51fa546353b2044a64a194520c6caa5ad@296

achadwick/libmypaint,achadwick/libmypaint,b3sigma/libmypaint,b3sigma/libmypaint,achadwick/libmypaint,achadwick/libmypaint,b3sigma/libmypaint