bad filenames when creating html/docbook using pretest

[Per Bothner]

Using texinfo-4.13.90 and generating --html
I get a lot of file names like this:
  Input_002dOutput.html
which should be:
  Input-Output.html

I.e. a hyphen "-" becomes "_002d".

Likewise, when generating --docbook I get bugos id names:
<chapter label="16" id="Input_002dOutput">

Another weirdness is that when generating html each @anchor tag
generates an extra html file containing a message like:

  <p>The node you are looking for is at <a 
href="Syntax-and-conditional- 
compilation.html#include_002drelative">include-relative</a>.</p>

These don't actually seem to be referenced, so I'm not sure if
this is just a bug or there is a reason for all these files.
--
        --Per Bothner
address@hidden   http://per.bothner.com/