[PATCH] Allow tangling to a list of files

[Jacopo De Simoi]

Dear All,

 Please find attached a patch (against master) that adds a feature to the tangle framework. Essentially, the following block would now tangle to two files

#+begin_src sh '("filename1" "filename2")
  #my script
#+end_src

Usecases

- literate config (e.g. .zshrc) of several machines at once (e.g.  tangling via tramp). 
- literate similar versions of the same script which differ only in small chunks (I use it for a slightly different latexmkrc for my projects on Dropbox)

The patch also streamlines the tangling routines.

Tests have been checked.

I am of course open to discussions and comments. Looking forward to hear from you. 
Thanks for your time

 Best
 Jacopo

0001-ob-tangle-Accept-lists-of-files-as-tangling-target.patch
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0002-org-manual-Update-docs.patch
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