Patch mostly by Serhiy Storchaka.

input was truncated in BASE64 section.

This fixes a regression relative to python2.

I'm checking this in without a test because not much of this code
is tested and I don't have time to work up the necessary extensions
to the existing test framework.

The patch itself was tested by the person who reported the bug.

Patch by Berker Peksag.

import and not *an* implementation.

containing non-encodable characters.  Added tests for TarFile.list().
Based on patch by Vajrasky Kok.

CID 1167595

The '**' operator is available only since 8.5 and in any case such large
integers are not supported on Tcl <8.5.

Issue #20426: When passing the re.DEBUG flag, re.compile() displays the debug output every time it is called, regardless of the compilation cache.

Improved error handling in variables-related commands.

exprlong() and exprboolean().

from the old green snake to the new new blue and yellow snakes.