Issue #370: convert print-stmt to -func: `PyInstaller`-part.
Issue #370: convert print-stmt to -func: old tests.
Issue #370: convert print-stmt to -func: tests.
Issue #370: convert print-stmt to -func: bootloader.
Issue #370: Fix compile.errors in pyi_archive.

Importing from __future__ effects `compile()`.
Merge branch 'issue-370' into develop.

This converts print-statmetns into print-functions, except
for 3rd-party libraries (residing in PyInstaller/lib). Effected
3rd-party lib is unittest2.