doc: Convert most sections index appendicies

I want this manual to be useful both to developers and users of TAME,
so this distinction needs to be made clear.

* doc/tame.texi (Preprocessor): chapter=>appendix.
* src/graph.texi: Top to appendix and raise subsections.
* src/symtable.texi: Top to appendix.

doc/tame.texi

@@ -99,8 +99,9 @@ TAME
 
 @include about.texi
 
+
 @node Preprocessor
-@chapter Preprocessor
+@appendix Preprocessor
 
 @menu
 * Macro Expansion::
@@ -117,11 +118,8 @@ TAME
 @include src/preproc/expand/expand-sequence.texi
 @raisesections
 
-@c chapter
-@raisesections
 @include src/graph.texi
 @include src/symtable.texi
-@lowersections
 
 @include license.texi
 

src/graph.xsl

@@ -33,7 +33,7 @@
 
 <!--
   @node Dependency Graph
-  @section Dependency Graph
+  @appendix Dependency Graph
 
   The dependency graph is a directed graph consisting of
     every known symbol,
@@ -197,7 +197,7 @@
 
 <!--
   @node Package Subgraphs
-  @subsection Package Subgraphs
+  @section Package Subgraphs
 
   Each package has its own independent dependency graph.
   These vertices may have @dfn{virtual edges} to other packages'
@@ -289,7 +289,7 @@
 
 <!--
   @node Graph Lookups
-  @subsubsection Graph Lookups
+  @subsection Graph Lookups
 -->
 
 <!--

src/symtable.xsl

@@ -32,7 +32,7 @@
 
 <!--
   @node Symbol Table
-  @section Symbol Table
+  @appendix Symbol Table
 
   The @dfn{symbol table} holds declarations for each symbol known to
     a@tie{}particular package.
@@ -111,9 +111,7 @@
   * Symbol Types::   Symbols describing various objects
   @end menu
 
-  @lowersections
   @include src/symtable/symbols.texi
-  @raisesections
 -->
 
 </stylesheet>