Make markdown links consistent on cursor exits

Make the versions of link with and without * behave alike:

-   don't set the 0 location so that the cursor exits.
    Having a 0 in the title is bad because titles are short.

-   either open a new line at end for both, or for neither

    The only case where the newline is certain is for link definitions.
Merge pull request #485 from cirosantilli/markdown-links-consistent

Markdown: Make markdown links consistent on cursor exits