bug#8754: submission of vimvars

[James Youngman]

Sorry, I'm attaching the patch instead of sending it inline, contrary
to the contribution guidelines, but I'll include the commit message
inline.  Google already has an FSF copyright assignment for Emacs;
fwiw, so do I.   Feedback on the right place in the manual to document
this would be particularly welcome, since I wasn't certain which the
optimal spot was.


 Add new module vimvars

 * emulation/vimvars.el: New file; supports "vi: set foo" mode
 lines in vi, ex, vim and similar editors.
 * custom.texi (vi-compatible modeline): New section describing vimvars.
 * misc.texi (Emulation): Mention vimvars.
 * NEWS: Mention addition of vimvars.el.

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vimvars-submit.diff
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