Remove unnecessary debug output (writes are very slow)

This shaves ~1m off of the total build time for our largest system.  Output
is impressively slow.

Around this point in time, we have the following profile from V8's sampling
profiler:

  [JavaScript]:
     ticks  total  nonlib   name
       36    2.8%   10.7%  LazyCompile: *anyValue [...]/ui/package.strip.new.js:31020:22
        3    0.2%    0.9%  LazyCompile: *m1v1u [...]/ui/package.strip.new.js:30941:19
        2    0.2%    0.6%  LazyCompile: *precision [...]/ui/package.strip.new.js:30934:23
        1    0.1%    0.3%  LazyCompile: *vu [...]/ui/package.strip.new.js:30964:16
        1    0.1%    0.3%  LazyCompile: *init_defaults [...]/ui/package.strip.new.js:31341:27

src/current/include/preproc/macros.xsl

@@ -68,7 +68,9 @@
       <preproc:repass-record />
       -->
 
+      <!-- output is slow and this happens a lot
       <message>[preproc] *REPASS*</message>
+      -->
 
       <!-- perform the repass -->
       <apply-templates select="$nodeset" mode="preproc:macropass">

src/current/include/preproc/package.xsl

@@ -594,10 +594,6 @@
     <copy>
       <sequence select="@*" />
 
-      <message>
-        <text>[preproc] *resolving symbol attributes...</text>
-      </message>
-
       <apply-templates mode="preproc:resolv-syms">
         <with-param name="orig-root" select="$orig-root" />
         <with-param name="symtable-map" select="$symtable-map" tunnel="yes" />
@@ -612,20 +608,6 @@
   <choose>
     <!-- repass scheduled; go for it -->
     <when test="$repass">
-      <message>[preproc] *SYM REPASS*</message>
-      <message>
-        <text>[preproc] The following </text>
-          <value-of select="count( $repass )" />
-        <text> symbol(s) are still unresolved:</text>
-      </message>
-
-      <for-each select="$repass">
-        <message>
-          <text>[preproc] - </text>
-          <value-of select="@ref" />
-        </message>
-      </for-each>
-
       <apply-templates select="$result" mode="preproc:resolv-syms">
         <with-param name="orig-root" select="$orig-root" />
         <with-param name="rpcount" select="$rpcount + 1" />

src/current/include/preproc/symtable.xsl

@@ -119,10 +119,6 @@
     <sequence select="@*" />
 
     <variable name="new">
-      <message>
-        <text>[preproc/symtable] discovering symbols...</text>
-      </message>
-
       <preproc:syms>
         <apply-templates mode="preproc:symtable">
           <!-- we only need this param for the root children, so this is the only
@@ -309,8 +305,6 @@
       </apply-templates>
     </preproc:symtable>
 
-    <message select="'[preproc/symtable] done.'" />
-
     <!-- copy all of the original elements after the symbol table; we're not
          outputting them as we go, so we need to make sure that we don't get
          rid of them; discard any existing symbol table -->
@@ -456,10 +450,6 @@
   <param name="new"        as="element( preproc:syms )" />
   <param name="this-pkg"   as="element( lv:package )" />
 
-  <message>
-    <text>[preproc/symtable] processing symbol table...</text>
-  </message>
-
   <variable name="cursym" as="element( preproc:sym )*"
                 select="preproc:symtable/preproc:sym[
                           not( @held = 'true' ) ]" />
@@ -549,8 +539,6 @@
       </choose>
     </for-each>
   </preproc:syms>
-
-  <message select="'[preproc/symtable] done processing symbol table.'" />
 </template>
 
 
@@ -606,12 +594,6 @@
        assertions, resolve relative paths -->
   <variable name="import-default-path" select="$import-path" />
 
-  <message>
-    <text>[preproc/symtable] importing symbol table of </text>
-    <value-of select="$import-path" />
-    <text>...</text>
-  </message>
-
   <!-- attempt to import symbols from the processed package -->
   <if test="not( $syms )">
     <message terminate="yes">

src/current/include/preproc/template.xsl

@@ -414,11 +414,6 @@
   <variable name="name" select="concat( '___i', generate-id(.), '___' )" />
   <variable name="inline" select="." />
 
-  <message>
-    <text>[preproc] preparing inline template </text>
-    <value-of select="$name" />
-  </message>
-
   <!-- generate template -->
   <lv:template name="{$name}" desc="Inline template"
                preproc:from-inline="{$name}"