Wltp

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- Relax some conditions on inputs:

- Just warn on Pwot-normalized > 1 or > n_idle or < 1.2 x n_rated
(BUT not extrapolate)
- allow float as `v_max`.
- build:
- drop `sphinx_rtd_theme` dependency - provided by default these days.
- drop pip-installin of `xlwings` attrocity if missing.

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- Fix py36 "nested regex" warning on ``pandel`` module.
- Pin ``jsonschema <3`` to fix validation, was also ``>2.5``, so now maximum ``2.6``.
- Updates to `setup.py` and dependencies.
- Minor documentation fixes.
- VSCode files & dev plugins.

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Quick'n Dirty release to remove ``matplotlib`` from dependencies.

- fix(main): ``--gui``and ``--excelrun`` were preventing cmd-line launches,
the ``-M`` option did not work due to bad argument type-parsing.
- Dependencies:
- drop *easygui* dependency.
- BREAK: move ``matplotlib`` to extras ``[plot]``, so ``co2mpas`` docker-image
does not load Qt and other heavy graphical stuff.

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- fix(deps): pandas-v0.20.1 dropped PandasError classs -
See https://github.com/pydata/pandas-datareader/issues/305
- fix(main): regression in `v0.1.0-alpha.0`, main did not import due to
not fully deleted *tkui* launch code.
- style(pep8): del spaces from python files.
- chore(build): add ``./dib/bumpver.py`` script from post-`co2mpas-1.6.1.dev6`.

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- fix(build, 3): Dependency *xlwings* broke builds on Linux in downstream packages.

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- feat(core): modify acceleration rule ``3s-->2s`` to assimilate more to *phase-1b*.
- feat(ui): drop tkUI code and *Pillow* dependency.