Corrects position of heading text to be as mentioned in the 4.01
transitional standard, see http://www.w3.org/TR/html4/struct/links.html#h-12.1.1.
For example, changes
<H1><a name="Introduction"></a>2 Introduction</H1>
to
<H1><a name="Introduction">2 Introduction</a></H1>
The changes will convert the old incorrect usage should an html file
using the old approach be added in the future.
Auto generated anchor names won't override a non auto generated anchor name, thereby making it possible to have anchor names that won't change should an extra heading be added earlier in the file
git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@6073 626c5289-ae23-0410-ae9c-e8d60b6d4f22
