py bindings -- add optional mutate_more mode
py bindings -- add optional mutate_more mode


Former-commit-id: ad3635f34f1ec698e9749e0c4da463a999b14d72
Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide