Adi-devgen

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- Add doOnRemote(), squash() and getUnpushedCommits().

- Fix "cannot find virtenv" in addPlone().

- Re-add default-filename "main" for generating stylesheet, Javascript,
Python-script and a template via addOn().

- Fix, if browserlayer is missing in addCss() and addJs().

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- Add addView().

- Add default-values of a function's expected arguments to help-msg.

- Fix path: Use dot instead of slash, for a resources' paths in
js-registry-generation.

- Let getAddonPath() fail with an exit, to prevent further
code-executions.

- Rename addBrowserSkel() to addBrowser(), addSkinSkel() to addSkin,
and so on, for less typing.

- Fix addBrowser() and addSkin() from scratch – if not added on top of existing
addon.

- Improve addAndRegisterView().

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- Generate missing browser-slug in config.

- Change docs from MD-format to RST, as pypi requires.

- Add addCss() and addJs().

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- Fix missing import and typo in setup.py-generation, which broke addons-installs.

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- Update README, improve installPlone().

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- Fix imports, better hlp-msgs, improve installPlone().