Add &ts setting and comment regarding .local.vimrc usage

.local.vimrc

@@ -1,3 +1,12 @@
+" Project vimrc file. To be sourced each time you open any file in this 
+" repository. You may use [vimscript #3393][1] [(homepage)][2] to do this 
+" automatically.
+"
+" [1]: http://www.vim.org/scripts/script.php?script_id=3393
+" [2]: https://github.com/thinca/vim-localrc
 setlocal noexpandtab
+" Despite promise somewhere alignment is done only using tabs. Thus setting 
+" &tabstop is a requirement.
+setlocal tabstop=4
 let g:syntastic_python_flake8_args = '--ignore=W191,E501,E121,E122,E123,E128,E225,W291,E126'
 let b:syntastic_checkers = ['flake8']