Add toc_link_format option

Add an option for setting the format of the links in the Table of Contents:
- Extended (the current and default)
- Brief (new format for the Vimwiki markup)

autoload/vimwiki/base.vim

@@ -1893,11 +1893,13 @@ function! vimwiki#base#table_of_contents(create)
     for idx in range(h_level, 5) | let headers_levels[idx] = ['', 0] | endfor
 
     let h_complete_id = ''
-    for l in range(h_level-1)
-      if headers_levels[l][0] != ''
-        let h_complete_id .= headers_levels[l][0].'#'
-      endif
-    endfor
+    if vimwiki#vars#get_global('toc_link_format') == 0
+      for l in range(h_level-1)
+        if headers_levels[l][0] != ''
+          let h_complete_id .= headers_levels[l][0].'#'
+        endif
+      endfor
+    endif
     let h_complete_id .= headers_levels[h_level-1][0]
 
     if numbering > 0 && numbering <= h_level
@@ -1916,8 +1918,10 @@ function! vimwiki#base#table_of_contents(create)
   for [lvl, link, desc] in complete_header_infos
     if vimwiki#vars#get_wikilocal('syntax') == 'markdown'
       let link_tpl = vimwiki#vars#get_syntaxlocal('Weblink2Template')
-    else
+    elseif vimwiki#vars#get_global('toc_link_format') == 0
       let link_tpl = vimwiki#vars#get_global('WikiLinkTemplate2')
+    else
+      let link_tpl = vimwiki#vars#get_global('WikiLinkTemplate1')
     endif
     let link = s:safesubstitute(link_tpl, '__LinkUrl__',
           \ '#'.link, '')