Patch by Frederick Wagner (issue #26347)

Patch by Chris Angelico (issue #26221)

Patch by Vladimir Rutsky.

In practice, bytecode instruction arguments are unsigned. Update the assertion
to make it more explicit that argument must be greater or equal than 0.

Rewrite also the comment.

Initialize i variable if the string is non-ASCII.

Issue #26464: Fix str.translate() when string is ASCII and first replacements
removes character, but next replacement uses a non-ASCII character or a string
longer than 1 character. Regression introduced in Python 3.5.0.

when resulting prefix length is equal to maximal prefix length.
Based on patch by Xiang Zhang.

when resulting prefix length is equal to maximal prefix length.
Based on patch by Xiang Zhang.

Doc/build/html/library/idle.html, which is built from Doc/library/idle.rst.
Help.html is an rstrip()ed copy of idle.html that can be pushed.

The displayed content is unchanged because a) the version number is not
displayed, being inherent in the version displaying the file and b) the tt
tag was ignored by the custom parser in idlelib/help.py.  The wrapped
<span class="pre"> tags remain as they were.

This will be merged in 3.6 (without conflict) because the 3.6 help.html is
a copy of the 3.5 file (which was a copy of the 3.4 file).  The two files will
remain the same until either a) there is a content change that only applies
to one of them or b) 3.5 maintenance ends and the 3.6 file is itself rebased.

* Inline compiler_use_new_block() function into its only callee,
  compiler_enter_scope()
* Remove unused NEW_BLOCK() macro