transfer-encoding: added new option and cmdline

Added CURLOPT_TRANSFER_ENCODING as the option to set to request Transfer
Encoding in HTTP requests (if built zlib enabled). I also renamed

transfer-encoding: added new option and cmdline

Added CURLOPT_TRANSFER_ENCODING as the option to set to request Transfer
Encoding in HTTP requests (if built zlib enabled). I also renamed
CURLOPT_ENCODING to CURLOPT_ACCEPT_ENCODING (while keeping the old name
around) to reduce the confusion when we have to encoding options for
HTTP.

--tr-encoding is now the new command line option for curl to request
this, and thus I updated the test cases accordingly.

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return code cleanup: build, init and run-time errors

Stop the abuse of CURLE_FAILED_INIT as return code for things not being
init related by introducing two new return codes:

CU

return code cleanup: build, init and run-time errors

Stop the abuse of CURLE_FAILED_INIT as return code for things not being
init related by introducing two new return codes:

CURLE_NOT_BUILT_IN and CURLE_UNKNOWN_OPTION

CURLE_NOT_BUILT_IN replaces return code 4 that has been obsoleted for
several years. It is used for returning error when something is
attempted to be used but the feature/option was not enabled or
explictitly disabled at build-time. Getting this error mostly means that
libcurl needs to be rebuilt.

CURLE_FAILED_INIT is now saved and used strictly for init
failures. Getting this problem means something went seriously wrong,
like a resource shortage or similar.

CURLE_UNKNOWN_OPTION is the option formerly known as
CURLE_UNKNOWN_TELNET_OPTION (and the old name is still present,
separately defined to be removed in a very distant future). This error
code is meant to be used to return when an option is given to libcurl
that isn't known. This problem would mostly indicate a problem in the
program that uses libcurl.

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symbols-in-versions: make test 1119 happy

symbols-in-versions: many corrections

Scanned with a tool that checked for mistakes and this is the subsequent
cleanup.

symbols-in-versions: remove duplicates

symbols-in-versions: 2 corrections

CURLE_CHUNK_FAILED and CURLE_FTP_BAD_FILE_LIST were introduced in
7.21.0, not 7.20.1

symbols-in-versions: sorted

I forgot to sort it when I added the CURL_SOCKOPT_* symbols

SOCKOPTFUNCTION: documented new return codes

CURLE_TLSAUTH_FAILED: removed

On second thought, I think CURLE_TLSAUTH_FAILED should be eliminated. It
was only being raised when an internal error occurred while allocating
or setti

CURLE_TLSAUTH_FAILED: removed

On second thought, I think CURLE_TLSAUTH_FAILED should be eliminated. It
was only being raised when an internal error occurred while allocating
or setting the GnuTLS SRP client credentials struct. For TLS
authentication failures, the general CURLE_SSL_CONNECT_ERROR seems
appropriate; its error string already includes "passwords" as a possible
cause. Having a separate TLS auth error code might also cause people to
think that a TLS auth failure means the wrong username or password was
entered, when it could also be a sign of a man-in-the-middle attack.

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symbols-in-versions: add the new TLSAUTH-SRP symbols

symbols-in-versions: CURLOPT_KEYPASSWD fixed

It was added in 7.17.0 and is not deprecated

HTTP Auth: Add CURLAUTH_ONLY

This is a meta symbol. OR this value together with a single specific
auth value to force libcurl to probe for un-restricted auth and if not,
only that si

HTTP Auth: Add CURLAUTH_ONLY

This is a meta symbol. OR this value together with a single specific
auth value to force libcurl to probe for un-restricted auth and if not,
only that single auth algorithm is acceptable.

For example you can use CURLAUTH_DIGEST|CURLAUTH_ONLY to make libcurl
first probe for what method to use, but yet only consider Digest to be
acceptable.

Using _only_ CURLAUTH_DIGEST without the CURLAUTH_ONLY field, will make
libcurl explicitly use Digest right away and not do any probing.

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symbols-in-version: add CURL_SOCKET_BAD

I also documented the filtering logic in the symbol-scan.pl function to
clarify why not all CURL_* symbols are included.

CURLOPT_RESOLVE: documented

symbols-in-versions: added 119 missing symbols

I've developed a script I call symbol-scan.pl that scans the curl.h and
multi.h header files and compare the symbols it finds in there with

symbols-in-versions: added 119 missing symbols

I've developed a script I call symbol-scan.pl that scans the curl.h and
multi.h header files and compare the symbols it finds in there with the
symbols symbols-in-versions documents and outputs a report on the
differences. Using this I've dug through the history to fill up
symbols-in-versions with all the symbols my script found mismatches for.

I will commit symbol-scan.pl separatly and think of a way to put it to
use in the build/tests so that we from now on will get this in-sync
check automatically.

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symbols-in-versions: added missing symbols

spellfix: CURLOPT_TFTP_BLKSIZE it is

getinfo: added *_PRIMARY_PORT, *_LOCAL_IP and *_LOCAL_PORT

ftp wildcard: a new option CURLOPT_FNMATCH_DATA

updated with symbols added in recent commits for 7.21.0

removed trailing whitespace

more symbols added in 7.20.0

cleanups by Julien Chaffraix

added CURLOPT_FTP_USE_PRET

CURLOPT_HEADERDATA was added in 7.10