vim setup for editing rst files

Here is a vim setup that should ease writing of rst files that follow Python documentation guidelines.

1. make sure your ~/.vimrc file contains the following line:

   filetype plugin indent on

2. create directory ~/.vim/ftplugin/ if it does not exist yet

   mkdir -p ~/.vim/ftplugin/

3. copy there the rst.vim file.

You may need to restart vim if step 1 has not been done before.