python-mode.el 6.2.1 "Titmouse"

- Handle PEP 492 async coroutines

- Logic of py-indent-region WRT lp:1426903
  In case first line accepts an indent,
  keep the remaining lines' relative.
  Otherwise lines in region get outmost indent,
  same with optional argument

- Commands
  - py-match-paren
    If at a beginning, jump to end and vice versa.
    Matches lists, block, statement, string and comment

  - ipython2.7
  - ipython3

  - py-beginning-of-for-block
  - py-beginning-of-for-block-bol
  - py-end-of-statement-bol
  - py-end-of-top-level-bol

  - py-flycheck-mode - toggle `flycheck-mode' from menu "Checks"

  - py-execute-section - execute arbitrary chunks of code
  - py-execute-section-python
  - py-execute-section-python2
  - py-execute-section-python3
  - py-execute-section-ipython
  - py-execute-section-ipython2.7
  - py-execute-section-ipython3
  - py-execute-section-jython

  - py-sectionize-region
  - py-backward-section
  - py-forward-section

  - py-narrow-to-block
  - py-narrow-to-block-or-clause
  - py-narrow-to-class
  - py-narrow-to-clause
  - py-narrow-to-def
  - py-narrow-to-def-or-class
  - py-narrow-to-statement

- New helper functions, like
  - py--end-of-block-bol-p
  - py--end-of-clause-bol-p
  etc.

  Functions in a boolean sense just stating if being at an end or
  start no longer a command. Renamed as interanal
  functions with prefix `py--' now.

- TAB-indent from column zero: go to outmost first, lp:1375122
- (I)Python-shell setup made more reliable

New customizables:

- py-imenu-max-items, default is 99
  Sets `imenu-max-items'

- py-python-edit-version, default is ""
  When not empty, fontify according to Python version specified.

- py-pdb-executable, default is nil
  Indicate PATH/TO/pdb.

- py-update-gud-pdb-history-p, default is t
  If pdb should provide suggestions WRT file and pdb-path.

- py-split-window-on-execute-threshold, default is 3
  Don't split when max number of displayed windows is reached.

Renamed:
- py-beginning-of-commented-section --> py-beginning-of-comments
- py-narrow-to-defun --> py-narrow-to-def