In some cases Content-Length: couldn't be replaced by an application

Also, indented some code properly

To avoid that the progress meter headers get output between each
transfer, make sure the bits gets kept when (re-)inited.

Reported by: Christopher Stone

my_setopt and my_setopt_str no longer ignores curl_easy_setopt result.

Fixed some OOM handling issues.

Verifies the fix from commit 322f3d5a

I think curl should ignore this case and smtp.c should test for this.
Since RFC-2821 seems to allow a "null reverse-path". Ref.  "MAIL
FROM:<>" in section 3.7, page 25.

Example:
* upload completely sent off: 35out of 35 bytes

Should be:
* upload completely sent off: 35 out of 35 bytes

Related code not ready yet for this kind of checks.

Suffix rules cannot have any prerequisites of their own.

Added envvars to specify OpenSSL include, libpath and lib.
Added rule to create curlbuild.h from curlbuild.h.dist.

my_setopt and my_setopt_str no longer ignores curl_easy_setopt result.

Fixed some OOM handling issues.

Overhauled FindWin32CACert()

All paths to dependencies now quoted; synced examples makefile.

Also added check for __x86_64__ define since MinGW64 seems to define
the _M_X64 macro through a header not available for config-win32.h.

Fix posted by Tomas Hoger <thoger redhat com>.

Expanded the section about CURLOPT_URL to include the format of the URL
and detailed information and examples relating to specific protocols.

Fixed Curl_gethostname() so that it always returns the un-qualified
machine name rather than being dependent on the socket provider.

Note: The return of getenv("CURL_GETHOSTNAME") is also parsed in case
the developer / test harness provided a fully qualified domain name as
it's value as well.

Additionally function my_useragent() now provides default User-Agent string

Reorder handling of fields to match same order as the one given by current
definition order of 'Configurable' struct fields. Fields currently not handled
marked for further inspection.

Reviewing fields being free'd in free_config_fields() still pending