Reported-by: Olen Andoni
Fixes #3906
Closes #3907

- replace tabs with spaces where possible
- remove line ending spaces
- remove double/triple newlines at EOF
- fix a non-UTF-8 character
- cleanup a few indentations/line continuations
  in manual examples

Closes https://github.com/curl/curl/pull/3037

Make the number parser aware of the maximum limit curl accepts for a
value and return an error immediately if larger, instead of running an
integer overflow later.

Fixes #1730
Closes #1736

Avoid casting away low-level const.

... and instead properly respond with an error message to the user
instead of silently ignoring.

Fixes #1453
Closes #1458

- Add new option CURLOPT_DEFAULT_PROTOCOL to allow specifying a default
protocol for schemeless URLs.

- Add new tool option --proto-default to expose
CURLOPT_DEFAULT_PROTOCOL.

In the case of schemeless URLs libcurl will behave in this way:

When the option is used libcurl will use the supplied default.

When the option is not used, libcurl will follow its usual plan of
guessing from the hostname and falling back to 'http'.

Added initial support for --next/-: which will be used to replace the
rather confusing : command line operation what was used for the URL
specific options prototype.

In preparation for parsing global options added the GlobalConfig
structure to the getparameter() function.

warning: declaration of 'struct GlobalConfig' will not be visible
outside of this function