CI: make sure funpack is on pypath

See merge request !73

CI: job tags

See merge request !72

Rf/dupe columns

See merge request !71

and will also be adapted for auto-gen of HTML version of demo, for use as
static documentation

real reason

as it interferes with the default merging behaviour

stage, and end-to-end run

filenames/encodings/loaders/indexes

input files/loaders/indexes

filenames/indexes/loaders/sniffers

a FileInfo object.