updated roff.charmap file + XML charmap

Steve,

Attached is an updated roff.charmap file for use with utf8trans. There
are some incorrect mappings in the current docbook2X charmap that this
fixes. It also adds a bunch of new mappings. The total number of
mappings in it is around 800.

I generated the file from an XML version that I made (also attached).
The XML version follows the "character map" format specified in the XSLT
2.0 working draft[1], but it can be used with an appropriate XSLT 1.0
stylesheet and any XSLT 1.0 processor.

[1] http://www.w3.org/TR/xslt20/#character-maps

(I'm finishing up work on an XSLT 1.0 stylesheet that will enable users
to do unicode character conversion to roff purely using XSLT. Of course
it's very slow -- at least 10 or 20 times slower than doing it with
utf8trans. But if you use it with some subset of the character map
instead of the whole 800-character map, the performance is acceptable.)

In order to make the XML character map more readable, I made up some
"extension attributes"[2] (unichar:name and unichar:entity) and added
them to the xsl:output-character element. So, a complete example for
particular character goes like this:

  <xsl:output-character
    char="&#x00a9;"
    unichar:name="COPYRIGHT SIGN"
    unichar:entity="copy"
    string="¥(co"
  />
Use of such extension attributes is permitted by the XSLT 2.0
spec; see the "Extension Attributes" section[2].

[2] http://www.w3.org/TR/xslt20/#extension-attributes

  --Mike

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