Create VM ELPA package

This bug has been copied automatically from: https://bugs.launchpad.net/vm/+bug/1637872
Reported by 'Mark Diekhans' on 2016-10-30 :

A ELPA package would make VM easier to install and maintain.

A issue is the C encode/decode programs.  I don't believe ELPA has any
mechanism to compile C code.  However, they have no dependencies beyond
the C library, which means the only configuration requirement is the C
compiler itself.