Phenodata

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- Add some sanity checks protecting against empty intermediate results
- Add "--verbose" option for enabling the DEBUG log level in turn displaying processed files
- Also skip file "Kulturpflanze_Ruebe_hist" completely as it has an invalid header format (all caps)
- Also skip files matching "PH_.+_Notiz" completely as they contain metadata
- Improve empty value removal before postprocessing
- Add column "Tag" for "--humanize" option

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- Fix accidental version bump of the "docopt" module,
see also https://github.com/peritus/bumpversion/issues/168
- Update documentation

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- Yet another documentation update

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- More documentation updates

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- Minor documentation updates

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- Add "--show-ids" parameter to show IDs alongside resolved text representation when using "--humanize"
- More compact date output for "tabular" mode
- Fix datetime coercion when encountering invalid datetime values
- Humanize searching in "observation" and "forecast" data for stations, species, phases and quality information
- Implement predefined sets of parameters using ``presets.json``.
Apply with e.g. "--species-preset=mellifera-de-primary".
See also https://community.hiveeyes.org/t/phanologischer-kalender-entwicklung/664/23.
- Reduce logging verbosity. Add progress bar for data acquisition step.
- Use "appdirs" module for computing cache storage location