Add script to find equivs and improve control (#7)

The new script findEquivs has the goal of finding Debian packages
that a manual installation of TeX Live replaces. It works as follows:

(1) use apt-file to find packages that contain a file in /opt/texbin
(2) see which packages from (1) have all their binaries contained
    in /opt/texbin

This script could be improved to reduce false positives and to detect
packages that are equivalent that do not contain binaries. See
comments in the script for more ideas to improve it.

The following packages (found by findEquivs) are added:

  texlive-lang-cjk
  asymptote
  biber
  jadetex
  makejvf
  mendexk
  m-tx
  pdfjam
  pmx
  xmltex
Alphabetize package list

Also, remove a duplicate of musixtex.
Add asymptote-doc to Debian control (see #10)

findEquivs does not currently find non-binary package equivalents.

Thanks to Carlos da Costa.
Updates for TeX Live 2014

Note that nothing substantial needed to be changed for TeX Live 2014.