Use the '--netrc' cmdline option or set the 'netrc' config option
to 'true' to enable the use of .netrc authentication data.
The 'machine' names for the .netrc info are the lowercase extractor
names (or categories): batoto, exhentai, nijie, pixiv, seiga.
the 'skip' config option controls skipping behavior:
true - skip download if file already exist (default)
false - download and overwrite files even if it exists
"abort" - abort extractor run if a download would be skipped
(same as '--abort-on-skip')
