Add package twolame

TwoLAME is an MP2 (MPEG Audio Layer 2) encoder. The library is LGPL.
Website: http://www.twolame.org/

Built via autotools. No special dependencies; libsndfile is only used
for the command-line encoder, not for the library.
Build sox with twolame support
Fix ocaml-xml-light section in index.html

In index.html, use the full name of package ocaml-xml-light and fix
the website link (used to 404). Also change the URL in the
src/ocaml-xml-light.mk UPDATE section accordingly.
Merge pull request #151 from uklauer/twolame

Add TwoLAME
Merge pull request #150 from uklauer/linkfix

Fix ocaml-xml-light section in index.html
update package vmime
update package geos
update package pango
update package vmime
package vmime: fixes for pkg-config