Merge r1546730, r1583008, r1571369, r1552130, r1578760, r1592615, r1592632, r1595321, r1550302, r1550307, r1585435 from trunk:

fix whitespace in a debug message

s/comment/self-documenting/

normalize an ugly construct which somehow manages to return the correct value

This is annoying to see in a casual "LogLevel debug foo:traceX ..."




Use 'apr_table_setn' instead of 'apr_table_set' when possible in order to save memory.

Follow-up to r1592529:

Define default port for "scgi" schemes (as chosen by
mod_proxy_scgi) in a common location.

Suggested by: jailletc36


fix Doxygen markup error

Submitted by: jailletc36


Tweak a AP_DEBUG_ASSERT condition.
Valid index to use 'req_header_var_names' are 0...6

mod_auth_form: Add a debug message when the fields on a form are not
recognised.


mod_auth_form: Make the trace logging consistent through the notes, session
and form authentication steps.


mod_auth_form: update empty log tags.
Submitted by: trawick, covener, jailletc36, trawick, trawick, jailletc36, minfrin, minfrin, ylavic
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1599501 13f79535-47bb-0310-9956-ffa450edef68