inspired by: http://code.activestate.com/recipes/65212-convert-from-decimal-to-any-base-number/download/1/
python, base10_to_baseN_and_baseN_to_base10, especially base10 <----> base30
inspired by: http://code.activestate.com/recipes/65212-convert-from-decimal-to-any-base-number/download/1/
python, base10_to_baseN_and_baseN_to_base10, especially base10 <----> base30