next release - update inheritance, multiprocessing examples, bar_format without total

[casperdcl]

• update inheritance of submodules (fixes update submodules #790)
  • notebook
    • fully support bar_format (fixes tqdm_notebook: strange behavior when ncols is str and bar_format contains '{bar}' #594, fixes tqdm_notebook bar malformed when bar_format is specified. #649)
    • fully support set_* methods (fixes tqdm_notebook.set_description() ignores refresh=False #740 -> closes Fix #740 #741)
  • gui
  • move towards real submodules (Pythonic submodules architecture #198 (comment), major release v5 #561)
    • notebook (<- _tqdm_notebook)
    • gui (<- _tqdm_gui)
    • cli (<- _main)
    • std (<- _tqdm)
    • utils (<- _utils)
    • auto (<- auto/)
    • autonotebook (<- autonotebook/)
    • fix Pythonic submodules architecture #198 (vis Add tqdm_bare and tbrange as minimal example for ports developers #258 (comment))
    • prepare for delayed imports (should not import optional dependencies until actually necessary #176, 2nd issue in AttributeError: type object 'tqdm' has no attribute '_instances' #188)
    • re fix tqdm_notebook for pandas #245 tqdm_notebook for pandas
    • possibly prepare for Modularize tqdm.pandas -> tqdm_pandas #271 tqdm.pandas -> tqdm.pandas.register(tclass=tqdm.std.tqdm)? decorator?
    • update docs (readme, list of submods, contributing submods) as per Proposal for smooth rolling releases #252
    • prepare for future submods as per Polynomial regression to predict time (tqdm_regress, tsrange) #248, Add tqdm_bare and tbrange as minimal example for ports developers #258, Dask support #278, Bars #227, Adjust EMA smoothing coefficient #609, Implementation of pessimistic progress rate #158, Web-friendly tqdm #94, Create progress bar wrapper to use with dask #279, TqdmUpTo, Pythonic submodules architecture #198 (comment) (simple), Pythonic submodules architecture #198 (comment) (compat, perf, dload)
• support custom bar_format with unknown total (complements add Bar.__format__ helper #799)
• update multiprocessing examples (part of add py3 multithreading example, fix py2 and multiprocessing #796)
• fix notebook red block when file=None (closes Fix tqdm_notebook red block on explicit file=None #791)
• parallel (py)make test

After this is merged, open a new issue to deal with items marked "prepare" or unticked.

[codecov-io]

Codecov Report

Merging #800 into master will decrease coverage by 12.51%.
The diff coverage is 84.69%.

@@             Coverage Diff             @@
##           master     #800       +/-   ##
===========================================
- Coverage   98.08%   85.56%   -12.52%     
===========================================
  Files          10       15        +5     
  Lines         836      977      +141     
  Branches      145      169       +24     
===========================================
+ Hits          820      836       +16     
- Misses         11      136      +125     
  Partials        5        5