A simple curl wrapper which lets you use curl to download files
without having to remember any parameters.
Simply call wcurl with a list of URLs you want to download and
wcurl will pick sane defaults.

If you need anything more complex, you can provide any of curl's
supported parameters via the --curl-options option. Just beware
that you likely should be using curl directly if your use case is
not covered.

By default, wcurl will:
* Percent-encode whitespaces in URLs;
* Download multiple URLs in parallel if the installed curl's
version is >= 7.66.0;
* Follow redirects;
* Automatically choose a filename as output;
* Avoid overwriting files if the installed curl's version
is >= 7.83.0 (--no-clobber);
* Perform retries;
* Set the downloaded file timestamp to the value provided by the
server, if available;
* Disable curl's URL globbing parser so {} and [] characters in
URLs are not treated specially;
* Percent-decode the resulting filename;
* Use "index.html" as default filename if there's none in the
URL.