pkg debian: minor reorganization request for initiating sane debian packaging

Hello Singular Team,

the main two main purposes of this request is to wipe out the debian material (debian material and related stuff) and to add some missing material in the source tarball for intiating a sane debian packaging (m4 macros and doxygen missing material).
The first commit literally wipes the debian folder out of the git repository.
The second commit introduces a READM.pkg file that contains packaging information concerning Debian based distribution: this file is meant to suggest an alternative to the previously wipped out debain material.
The third commit add missing material to the source tarball: it adds the needed m4 files to regenerate the autotools material; it also add some files needed by Doxygen to generate the HTML documentation.
The fourth commit is rather a suggestion to gather the AUXilary scripts into a unique DIRectory.
The fifth commit suggest to wipe out the redhat material: it is meant for consistency only.

As concerns Debian packaging, the first and third commits are very important in that they will greatly ease my life as Debian package maintainer. Note that all the commit are not debian-centric, on the contrary. In fact, they are meant to ease generic packaging.

If the request is fulfilled, it would be great to create a new source tarball in such a way that I [1] can step forward the Debian packaging of Singular [2]. It would be also great to sign the source tarball [3,4].

Thanks,
Jerome

[1] https://qa.debian.org/developer.php?login=calculus%40rezozer.net
[2] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=764475
[3] http://narfation.org/2013/06/23/signed-upstream-tarballs-in-debian
[4] http://pgp.mit.edu/