add control characters representations
move expressions in second-level decorator function
move and improve pescan in tools
move import of fd
replace MASK_ALL_CHAR with a object
fix last action print in emit_simple
make pysec.xrange() signature equal to builtins' xrange()
add range()
new module for taint tracking
add Taint metaclass in Object, add type checking utilities
add flat_walk()
add type's name in deep_tb()
add blank line before EOF
new module to create and manage contexts