vim: fix ,u; re-add shift-tab

vimrc

@@ -297,9 +297,9 @@ noremap <C-G> 2<C-G>
 " endif
 
 " Re-source and edit vimrc, respectively
-nnoremap  ,u :source <C-R>=vimrc<CR><CR>
-" nnoremap  ,v :edit   <C-R>=vimrc<CR><CR>
-nnoremap ,v :vsplit $MYVIMRC<CR>
+nnoremap  ,u :source $MYVIMRC<CR>
+nnoremap  ,v :edit   $MYVIMRC<CR>
+" nnoremap ,v :vsplit $MYVIMRC<CR>
 
 nn  ,s :mks! Session.vim<CR>
 
@@ -571,6 +571,8 @@ endif
 " <Tab> and <S-Tab> indent and unindent code
 nmap <Tab> :><CR>
 vmap <Tab> :><CR>
+nmap <S-Tab> :<<CR>
+vmap <S-Tab> :<<CR>
 nnoremap <leader>f :Ag <C-R>=expand("<cword>")<CR><CR>
 
 " these "Ctrl mappings" work well when Caps Lock is mapped to Ctrl