When erroring out on a request being too large, the existing buffer was
leaked. Fix by explicitly freeing on the way out.

Closes #2966
Reviewed-by: Daniel Stenberg <daniel@haxx.se>

Closes #2984

This yields

  "the scheme is %s\n"

instead of

  "the scheme is %s0

Closes #2970

to help user understand what the problem is

Reported-by: Daniel Shahaf

Fixes #2763
Closes #2977

The previous test certificates contained RSA keys of only 1024 bits.
However, RSA claims that 1024-bit RSA keys are likely to become
crackable some time before 2010. The NIST recommends at least 2048-bit
keys for RSA for now.

Better use full 2048 also for testing.

Closes #2973

Closes #2968
Reviewed-by: Daniel Stenberg <daniel@haxx.se>

On Windows, the read function from <io.h> is used, which has its byte
count parameter as unsigned int instead of size_t.

Closes https://github.com/curl/curl/pull/2972

Closes https://github.com/curl/curl/pull/2979

- Use memcpy instead of strncpy to copy a string without termination,
  since gcc8 warns about using strncpy to copy as many bytes from a
  string as its length.

Suggested-by: Viktor Szakats

Closes https://github.com/curl/curl/issues/2980

Closes #2967

This example is simply not working correctly but there's nobody around
with the skills and energy to fix it.

Closes #2407

... to reflect the changes in 6015cefb

Closes #2955

Closes #2948

Rather than jumping backwards to where failure cleanup happens
to be performed, move the failure case to end of the function
where it is expected per existing coding convention.

Closes #2965

Closes #2963

If the formatting fails, we error out on a fatal error and
clean up on the way out. The array was however freed within
the wrong scope and was thus never freed in case the cookies
were written to a file instead of STDOUT.

Closes #2957

Expired cookies have already been purged at a later expiration time
before this check, so remove the redundant check.

closes #2962

Exit the realloc() loop if the response turns out ridiculously large to
avoid worse problems.

Reported-by: Harry Sintonen
Closes #2959

Closes #2960

Coverity CID 1439134

The expected error code is now 60. 51 is dead.

See header file and man pages for API. All documented API details work
and are tested in the 1560 test case.

Closes #2842

... including the associated option.

Fixes #2951
Closes #2952

Add functionality so that protocols can do custom keepalive on their
connections, when an external API function is called.

Add docs for the new options in 7.62.0

Closes #1641

Sometimes it may be considered a security risk to load an external
OpenSSL configuration automatically inside curl_global_init(). The
configuration option --disable-ssl-auto-load-config disables this
automatism. The Windows build scripts winbuild/Makefile.vs provide a
corresponding option ENABLE_SSL_AUTO_LOAD_CONFIG accepting a boolean
value.

Setting neither of these options corresponds to the previous behavior
loading the external OpenSSL configuration automatically.

Fixes #2724
Closes #2791

The gcc typecheck macros and coverity combined made it warn on the 2nd
argument for ERROR_CHECK_SETOPT(). Here's minor rearrange to please it.

Coverity CID 1439115 and CID 1439114.

SEC_E_APPLICATION_PROTOCOL_MISMATCH isn't defined in some versions of
mingw and would require an ifdef otherwise.

Reported-by: Thomas Glanzmann
Approved-by: Marc Hörsken
Bug: https://curl.haxx.se/mail/lib-2018-09/0020.html
Closes #2950

... and add "MAILINDEX".

As described in #2789, this is a suggested solution.  Changing UID=xx to
actually get mail with UID xx and add "MAILINDEX" to get a mail with a
special index in the mail box (old behavior).  So MAILINDEX=1 gives the
first non deleted mail in the mail box.

Fixes #2789
Closes #2815

This is step 3 of #2888.

Fixes #2888
Closes #2896

Closes #2668