don't crash if file to remove is absent anyway

fixes write and on_the fly mode in python3.6

remove the test to sys.stdout for on_the_fly, instead run if called from install()

use the same rules as python

use ascii (python2) or utf8 (python3) by default, and if another
e...

before that, while it worked correctly in python2 (why?), python3 would
silently stop if other m...

shouldn't break other versions

avoid breaking file output for python2.7

python3 fixes

fix module imports in result code

symbols imported in the result file weren't found in on-the-fly mode, using run_path instead of ...