Minor issues for 0.2.0

[ischoegl]

This is a running list of minor issues that should be taken care of:

• [x] Replace CTI/XML mechanisms by YAML mechanism
• [x] Fix #32 (same issue as #29)
• [x] Check/minimize dependencies (e.g. pandas, pytables) ... ensure that environment.y ml already satisfies everything.
• [x] Issue #26 ... not a good idea after all; improvements of docstrings take care of this
• [x] ~Remove output from YAML configuration (it will always be HDF)~ ... enable passing of arguments to write_hdf (e.g. force overwriting of existing groups)
• [x] Include #36
• [x] Replace all instances of io by pathlib
• [x] Address NaturalNameWarnings (#1)
• [x] Include #35 (@ischoegl)
• [x] Include #42/#43 (@ischoegl)
• [x] Include #45 (@ischoegl)
• [x] Finish implementation of Strategy, I.e. #25 (@ischoegl)
• [x] Fix bug in #49
• [x] Bump version to 0.2.0

Some remaining edits of Sphinx documentation

• [x] Move jupyter notebooks into a dedicated docs/examples folder (from current docs/pages) (@ischoegl ... see #45)
• [x] Add descriptions of how to run batch jobs from commandline to overview.rst, ignition.rst and adiabatic_flame.rst (see README.rst)
• [x] Check and fix broken links in Sphinx documentation (e.g. several links in README.rst)
• [x] Add instructions for conda environment to INSTALL.rst - see e.g. camsym
• [x] Update docstrings of SimulationHandler ... make description more generic (not tied to minimal example)

[ischoegl]

@DavidAkinpelu ... streamlined the code some more (there were some changes to main). I'm not planning to change anything else until you're done with the remaining items above.

[DavidAkinpelu]

Okay

[ischoegl]

@DavidAkinpelu I'm done with my updates, so it's just documentation now.