[CM] cm2: svg backend, permutation pattern

[anders.vinjar at bek.no]

Hi.

    T> https://forge.ircam.fr/p/omlibraries/downloads/639/).

If you want to check this, please use the most recent upload:
https://forge.ircam.fr/p/omlibraries/downloads/703/ (some bugfixes and
leftovers from the previous versions).

Fwiw, i use cm2 a lot (in recent version of lispworks and sbcl), using
the asd includeded with the sources at sf.net:

  https://svn.code.sf.net/p/commonmusic/code/branches/cm2

sbcl version is "1.4.2-1"

-anders