file parameters: remove virtualenv, config, cache, add system #178
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As we noticed in OCR-D/ocrd-website#196,
$VIRTUAL_ENV
should neither be the default nor even an option.$XDG_CACHE_HOME/ocrd-resources
is implemented in OCR-D/core#559 but was missing here.Only XDG option is now
$XDG_DATA_HOME
(=$HOME/.local/share
unless env var is overridden)Reintroduces
/usr/local/share/ocrd-resources
as a system-wide fallback for cases where$HOME
might vary, like in Docker.