Revert r25260; breaks several parser tests cases, seems to be borking up section...

Revert r25260; breaks several parser tests cases, seems to be borking up section IDs.
8 previously passing test(s) now FAILING! :(
   * Basic section headings  [Introduced between 29-Aug-2007 15:27:48, 1.11alpha (r25250) and 29-Aug-2007 15:55:07, 1.11alpha (r25289)]
   * Section headings with TOC  [Introduced between 29-Aug-2007 15:27:48, 1.11alpha (r25250) and 29-Aug-2007 15:55:07, 1.11alpha (r25289)]
   * Handling of sections up to level 6 and beyond  [Introduced between 29-Aug-2007 15:27:48, 1.11alpha (r25250) and 29-Aug-2007 15:55:07, 1.11alpha (r25289)]
   * TOC regression (bug 9764)  [Introduced between 29-Aug-2007 15:27:48, 1.11alpha (r25250) and 29-Aug-2007 15:55:07, 1.11alpha (r25289)]
   * TOC with wgMaxTocLevel=3 (bug 6204)  [Introduced between 29-Aug-2007 15:27:48, 1.11alpha (r25250) and 29-Aug-2007 15:55:07, 1.11alpha (r25289)]
   * Resolving duplicate section names  [Introduced between 29-Aug-2007 15:27:48, 1.11alpha (r25250) and 29-Aug-2007 15:55:07, 1.11alpha (r25289)]
   * Fuzz testing: Parser14  [Introduced between 29-Aug-2007 15:27:48, 1.11alpha (r25250) and 29-Aug-2007 15:55:07, 1.11alpha (r25289)]
   * -{}- tags within headlines (within html for parserConvert())  [Introduced between 29-Aug-2007 15:27:48, 1.11alpha (r25250) and 29-Aug-2007 15:55:07, 1.11alpha (r25289)]

Sample:
--- /tmp/mwParser-557844546-expected    2007-08-29 15:55:46.000000000 +0000
+++ /tmp/mwParser-557844546-actual      2007-08-29 15:55:46.000000000 +0000
@@ -1,16 +1,16 @@
 <table id="toc" class="toc" summary="Contents"><tr><td><div id="toctitle"><h2>Contents</h2></div>
 <ul>
-<li class="toclevel-1"><a href="#Level_1_Heading"><span class="tocnumber">1</span> <span class="toctext">Level 1 Heading</span></a>
+<li class="toclevel-1"><a href="#_Level_1_Heading"><span class="tocnumber">1</span> <span class="toctext">Level 1 Heading</span></a>
 <ul>

etc