Create INSTALL file via XSLT

As before, create an INSTALL.html file for processing with lynx, but use
xsltproc and a new XSLT stylesheet instead of jade and DSSSL.

Replacing jade with xsltproc removes jade from the requirements for
distribution building.

Reviewed-by: Magnus Hagander <magnus@hagander.net>

doc/src/sgml/stylesheet-text.xsl

@@ -0,0 +1,98 @@
+<?xml version='1.0'?>
+<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+                version='1.0'
+                xmlns="http://www.w3.org/TR/xhtml1/transitional"
+                exclude-result-prefixes="#default">
+
+<xsl:import href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"/>
+<xsl:import href="stylesheet-common.xsl" />
+
+<!-- The customizations here are somewhat random in order to make the text
+     output look good. -->
+
+<!-- no section numbers or ToC -->
+<xsl:param name="chapter.autolabel" select="0"/>
+<xsl:param name="section.autolabel" select="0"/>
+<xsl:param name="generate.toc"></xsl:param>
+
+<!-- don't need them, and they mess up formatting -->
+<xsl:template match="indexterm">
+</xsl:template>
+
+<xsl:template match="step">
+  <li>
+    <xsl:call-template name="common.html.attributes"/>
+    <xsl:call-template name="id.attribute"/>
+<!-- messes up formatting
+    <xsl:call-template name="anchor"/>
+-->
+    <xsl:apply-templates/>
+  </li>
+</xsl:template>
+
+<!-- produce "ASCII markup" for emphasis and such -->
+
+<xsl:template match="emphasis">
+  <xsl:text>*</xsl:text>
+  <xsl:apply-templates/>
+  <xsl:text>*</xsl:text>
+</xsl:template>
+
+<xsl:template match="para/command|para/filename|para/option|para/replaceable">
+  <xsl:call-template name="gentext.startquote"/>
+  <xsl:apply-templates/>
+  <xsl:call-template name="gentext.endquote"/>
+</xsl:template>
+
+<xsl:template match="filename/replaceable|firstterm">
+  <xsl:apply-templates/>
+</xsl:template>
+
+<!-- tweak formatting for note, warning, etc. -->
+<xsl:template name="nongraphical.admonition">
+  <div>
+    <xsl:call-template name="common.html.attributes">
+      <xsl:with-param name="inherit" select="1"/>
+    </xsl:call-template>
+    <xsl:call-template name="id.attribute"/>
+
+    <xsl:if test="$admon.textlabel != 0 or title or info/title">
+      <p>
+        <b>
+          <xsl:call-template name="anchor"/>
+          <xsl:apply-templates select="." mode="object.title.markup"/>:
+        </b>
+      </p>
+    </xsl:if>
+
+    <xsl:apply-templates/>
+  </div>
+</xsl:template>
+
+<!-- horizontal rules before titles (matches old DSSSL style) -->
+
+<xsl:template match="sect1/title
+                    |sect1/info/title
+                    |sect1info/title"
+              mode="titlepage.mode" priority="2">
+  <hr/>
+  <xsl:call-template name="section.title"/>
+</xsl:template>
+
+<xsl:template match="sect2/title
+                    |sect2/info/title
+                    |sect2info/title"
+              mode="titlepage.mode" priority="2">
+  <hr/>
+  <xsl:call-template name="section.title"/>
+</xsl:template>
+
+<xsl:template match="sect3/title
+                    |sect3/info/title
+                    |sect3info/title"
+              mode="titlepage.mode" priority="2">
+  <hr/>
+  <xsl:call-template name="section.title"/>
+</xsl:template>
+
+</xsl:stylesheet>