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XLink support

each inline element can also serve as a simple XLink

it is necessary to declare XLink namespace:

<article xmlns="http://docbook.org/ns/docbook" 
         xmlns:xl="http://www.w3.org/1999/xlink" 
         version="5.0">
  <title>Test article</title>

  <para><application xl:href="http://www.gnu.org/software/emacs/emacs.html">Emacs</application> 
    is my favorite text editor.</para>
  …

ulink was removed in favor of ubiquitous linking:

<link xl:href="http://docbook.org">DocBook site</link>

XLink with fragment identifier can be used for cross-references inside one document
```
<command linkend="dir">DIR</command>
<command xl:href="#dir">DIR</command>
```
- difference is in validation—linkend is checked during validation for ID/IDREF consistency
- XLink is not checked—can be useful for XInclude based modular documents