URL syntax

By now URLs must appear as a standalone paragraph. This is correct:

Go to:

http://novelang.sourceforge.net

And see all useful links.

But this is incorrect:

Go to http://novelang.sourceforge.net and see all useful links.

There is a good reason to keep the URL on its own line: most text editors make easy to copy a whole text line, so there is less chance to forget some characters when moving the URL inside the text or copy-pasting it to a Web browser. Aside of this, "http", ":" and "//" are legal Novelang grammar constructs (as word, punctuation sign, and start of italics, respectively) so a hint on where to find a URL makes the Novelang grammar much simpler. I've looked at the way Markdown and WikiCreole define hyperlinks. Both require too many delimiters; I prefer to leverage on the fact a URL takes place on its own line. The good thing to keep from Markdown is labelling (give a label to some URL and reuse it later through this label); one day Novelang will do the same through identifiers. So let's say this could become legal:

Go to 
http://novelang.sourceforge.net
and see all useful links.

There are at least two features missing: text for URL and advisory title (the one appearing in a tooltip). URL text and advisory title are about "decorating" some Novelang construct. This was previously discussed for identifiers. We could get something like:

Go to 
  "Novelang website" 
  [Novelang website on Sourceforge.net]
http://novelang.sourceforge.net
and see all useful links.

I don't want to use new delimiters for URL text and advisory title, in order to not transform Novelang grammar to some new flavor of XML. So let's say double quotes are for URL text and square brackets for advisory title. As a good news, this notation is consistent with the way to decorate paragraphs with identifiers. This strengthens the meaning of indentation as "here stands metadata stuff for the thing right below". So we're breaking previous decision to put chapter and section decorations below the header. It's amazing to see, how keeping consistency on a grammar carries the showckwave of small changes on long distances: here it was about adding URL text and now we're revising the way we write chapter and section headers.