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org tags: w is for writing

Writing includes grammar and typography.
Fix trailing whitespace cleaning

Function my/clean-buffer-formatting calls whitespace-cleanup. Its
functionality depends on 'whitespace-style' list variable that needs to
contain word 'trailing'.
minor doc formatting fixes
Set minor modes by calling the function

... not by setting the variable.
abbrev: add °C for degrees celcius

and other typos
minor doc and indentation issues
set perl to current version
point python mode and org babel to python3
recommended setup for languagetool
set geolocation automatically using osx-location
abbrev: autofix explicitely