delete useless code

.vimrc

@@ -38,7 +38,7 @@
     " Always switch to the current file directory
 
     set shortmess+=filmnrxoOtT          " Abbrev. of messages (avoids 'hit enter')
-    set viewoptions=folds,options,cursor,unix,slash " Better Unix / Windows compatibility
+    " set viewoptions=folds,options,cursor,unix,slash " Better Unix / Windows compatibility
     set virtualedit=onemore             " Allow for cursor beyond last character
     set history=1000                    " Store a ton of history (default is 20)
     set hidden                          " Allow buffer switching without saving
@@ -170,18 +170,7 @@
 
     set foldmethod=syntax
     autocmd FileType python set foldmethod=indent
-    set nofoldenable
-    " Code folding options
-    nmap <leader>f0 :set foldlevel=0<CR>
-    nmap <leader>f1 :set foldlevel=1<CR>
-    nmap <leader>f2 :set foldlevel=2<CR>
-    nmap <leader>f3 :set foldlevel=3<CR>
-    nmap <leader>f4 :set foldlevel=4<CR>
-    nmap <leader>f5 :set foldlevel=5<CR>
-    nmap <leader>f6 :set foldlevel=6<CR>
-    nmap <leader>f7 :set foldlevel=7<CR>
-    nmap <leader>f8 :set foldlevel=8<CR>
-    nmap <leader>f9 :set foldlevel=9<CR>
+    "set nofoldenable
 
     " Find merge conflict markers
     map <leader>fc /\v^[<\|=>]{7}( .*\|$)<CR>