- validate --lang values, fail immediately with invalid iso-639-1
country code
- ignore --lang value when using profile, print warning that profile
language takes precedence
- fixes #833

- add WARC-Protocol repeated header(s) for HTTP, TLS as per iipc/warc-specifications#42
- also set HTTP/1.0 on WARC record if actually http/1.0, otherwise keep HTTP/1.1

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Co-authored-by: Tessa Walsh <tessa@bitarchivist.net>

allows for customizing tmp directory with TMPDIR env var

Fast-follow to #842 to fix a typo

…known) or 206 as 200… (#835)

Avoids fetching duplicate content when fetched through different code
path (eg. autoplay behavior calling fetch, vs video playing automatically)

…and security metadata (#844)

- drop early serialization in handleFetchResponse(), can result in
writing WARC record too early, before the WARC-Protocol and other data
is available. (Added previously for requests loaded via browser context /
service worker which did not get a 'loadingFinished' message, but now
these will still be closed in awaitPageResources())
- don't log 'skipping URL from unknown frame' warning since it is often
spurious, since frame can be added in subsequent message and response is
*not* skipped.

bump version to 1.6.2