Remove cruft and add TODO's

plugin/functions.vim

@@ -27,17 +27,3 @@ function! CloneHighlightGroupWithAttributes(group, new_group, attributes)
   exe 'hi '.a:new_group.' '.l:parameters.
         \' term='.a:attributes.' cterm='.a:attributes.' gui='.a:attributes
 endfunction
-
-function! s:Synstack()
-  for l:id in synstack(line('.'), col('.'))
-    let l:attributes = synIDattr(l:id, 'name')
-    let l:attr = synIDattr(l:id, 'fg')
-    if l:attr !=? ''
-      let l:attributes = l:attributes.' fg='.l:attr
-    endif
-  endfor
-endfunction
-command Synstack :call s:Synstack()
-
-" Invoke terminal command without prompt and then redraw.
-command! -nargs=+ Silent execute 'silent <args>' | redraw!