This eliminates a few redundant test cases.

This is a backport of caf89a6a17a7.

Patch by Geoff Wilson.

Patch by Giampaolo Rodola'.

ByteArrayAsStringTest.fixtype() was converting test data to bytes, not byte-
array, therefore many of the test cases inherited in this class were not
actually being run on the bytearray type.

The tests in buffer_tests.py were redundant with methods in string_tests
.MixinStrUnicodeUserStringTest and string_tests.CommonTest. Moved some tests
into a new base class string_tests.NonStringModuleTest, and run them for
bytearray.

* Group functions into six new subsections
* Document the underlying Readline function or variable accessed
* get_history_length() returns the history file limit
* clear_history() is conditionally compiled in
* Clarify zero and one bases for history item indexes
* parse_and_bind() uses its argument directly as an init line
* Change "command line" to "line buffer" for consistency
* read_init_file() also executes the file
* read_history_file() replaces the previous history
* write_history_file() overwrites any existing file
* Differentiate history file lines from history list items, which could be
  multi-line
* Add more information about completion, also addressing Issue #10796
* libedit (Editline) may be used on any platform; detection is OS X specific

Also change BufferedReader.writable() and BufferedWriter.readable() to always
return False.

Affected classes are generic sequence iterators, iterators of bytearray,
list, tuple, set, frozenset, dict, OrderedDict and corresponding views.

Makefile.pre.in:
  - Modules/_math.o: Build using PY_CORE_CFLAGS as every extension

  - Modules/_math.o: Build using PY_CORE_CFLAGS as every extension
  - profile-opt: Fix bashism

These changes should not be visible to the user.

Adds a Python-2-only ssl module API and environment variable to
configure the default handling of SSL/TLS certificates for
HTTPS connections.

#26250: document the sqlite3.Cursor.connection attribute.  Initial patches by Aviv Palivoda and Varpu Rantala.

Issue #17758: Skip test_site if site.USER_SITE directory doesn't exist and
cannot be created.