tests: remove leading spaces from some tags

The threee tags `<name>`, `</name>` and `<command>` were frequently used
with a leading space that this removes. The reason this habbit is so

tests: remove leading spaces from some tags

The threee tags `<name>`, `</name>` and `<command>` were frequently used
with a leading space that this removes. The reason this habbit is so
widespread in testcases is probably that they have been copy and pasted.

Hence, fixing them all now might curb this practice from now on.

Closes #12028

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spelling: use 'reuse' not 're-use' in code and elsewhere

Unify the spelling as both versions were previously used intermittently

Closes #11717

test 675: add missing CR so the test passes when run through Privoxy

Closes #8959

tests: use %TESTNUMBER instead of fixed number

This makes the tests easier to copy and relocate to other test numbers
without having to update content.

Closes #6738

http: use credentials from transfer, not connection

HTTP auth "accidentally" worked before this cleanup since the code would
always overwrite the connection credentials with the credenti

http: use credentials from transfer, not connection

HTTP auth "accidentally" worked before this cleanup since the code would
always overwrite the connection credentials with the credentials from
the most recent transfer and since HTTP auth is typically done first
thing, this has not been an issue. It was still wrong and subject to
possible race conditions or future breakage if the sequence of functions
would change.

The data.set.str[] strings MUST remain unmodified exactly as set by the
user, and the credentials to use internally are instead set/updated in
state.aptr.*

Added test 675 to verify different credentials used in two requests done
over a reused HTTP connection, which previously behaved wrongly.

Fixes #6542
Closes #6545

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