0.6.0rc4
 - started changelog
 - support for seed/rand attribute in mathdox-jelly-util
 - support for randomizing multiple/single choice input in authortools/mcgroup
 - also support for randomizing answers in leamel
 - fixed bug with mathdox_first in combination with option
   mathdox:cacheable="jelly"
 - fixed bug in leamel2mathdox.xsl, occurring for exercise tags with id
   attribute
 - added support for @mathdox:seed attribute in top tag or in
   /exercises/exercise
   NOTE: for /exercises/exercise: if no @mathdox:seed attribute is present in
   the current exercise, a seed is drawn from the surrounding random and a new
   random object is created for the sub-exercise from that seed.
 - updated genericclient: jsxgraph support in phrasebook