Re: Get rid of "Section.N.N.N" on DOCs

First version of all files replaced.
I used a regex to get title tag which was on following line and added it as
xreflabel of of that sec1.

Simple one.
<sect1 id="parser-stage" xreflabel="The Parser Stage">
<title>The Parser Stage</title>

Removed <productname>, <literal>, <acronym> tags
<sect1 id="rule-system" xreflabel="The PostgreSQL Rule System">
<title>The <productname>PostgreSQL</productname> Rule System</title>

Maybe some of them are huge, like "Continuous Archiving and Point-in-Time
Recovery (PITR)" but I didn't change any of them.

This version I did not read all places where this changes affect, so
obviously will have a lot of places to be rewritten.

regards
Marcos

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