In XML output, remove redundant class attribute on symbol element.

* data/xslt/bison.xsl (xsl:key name="bison:symbolByName"): New.
* data/xslt/xml2xhtml.xsl (xsl:template match="symbol"): Use it to
look up a symbol to determine whether it's a nonterminal or terminal.
* src/gram.c (rule_rhs_print_xml): Remove class attribute.
* src/state.c (state_rule_lookahead_tokens_print_xml): Likewise.

Add prec/assoc information to XML output.
* src/gram.c (grammar_rules_print_xml): For each rule that has a
%prec, add a percent_prec attribute.
* src/print-xml.c (print_grammar): For each terminal that has a
precedence or associativity, add a prec or assoc attribute.
(xml_indent): New.
(xml_puts): Use xml_indent.
(xml_printf): Use xml_indent.
* src/print-xml.h (xml_indent): Prototype.

* tests/existing.at (GNU pic Grammar): Fix a rule miscopied from
<http://lists.gnu.org/archive/html/bug-bison/2003-04/msg00026.html>.

data/xslt/bison.xsl

@@ -26,6 +26,16 @@
   xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
   xmlns:bison="http://www.gnu.org/software/bison/">
 
+<xsl:key
+  name="bison:symbolByName"
+  match="/bison-xml-report/grammar/nonterminals/nonterminal"
+  use="@name"
+/>
+<xsl:key
+  name="bison:symbolByName"
+  match="/bison-xml-report/grammar/terminals/terminal"
+  use="@name"
+/>
 <xsl:key
   name="bison:ruleByNumber"
   match="/bison-xml-report/grammar/rules/rule"

data/xslt/xml2xhtml.xsl

@@ -552,7 +552,7 @@
 <xsl:template match="symbol">
   <xsl:text> </xsl:text>
   <xsl:choose>
-    <xsl:when test="@class = 'nonterminal'">
+    <xsl:when test="name(key('bison:symbolByName', .)) = 'nonterminal'">
       <span class="i"><xsl:value-of select="."/></span>
     </xsl:when>
     <xsl:otherwise>