New GNU ELPA package: compat - Compatibility Library

[Sacha Chua]

   Requires: emacs-24.3, nadvice-0.3
    Website: https://sr.ht/~pkal/compat
   Keywords: lisp 
 Maintainer: Compat Development <~pkal/compat-devel@lists.sr.ht>
     Author: Philip Kaludercic <philipk@posteo.net>

To allow for the usage of Emacs functions and macros that are
defined in newer versions of Emacs, compat.el provides definitions
that are installed ONLY if necessary.  These reimplementations of
functions and macros are at least subsets of the actual
implementations.  Be sure to read the documentation string to make
sure.

Not every function provided in newer versions of Emacs is provided
here.  Some depend on new features from the core, others cannot be
implemented to a meaningful degree.  The main audience for this
library are not regular users, but package maintainers.  Therefore
commands and user options are usually not implemented here.