Therion 0.2.16

[Martin Budaj]

Hi all,
new version of Therion is available on the web. Improvements include
 - centerline command has new team roles: instruments (insts),
   assistant (dog)
 - centerline command has new data readings:
     up/ceiling, down/floor, left, right, ignore
 - centerline may be spelled as centreline
 - deg:min:sec syntax allowed for degree values
 - point, line and area commands have new option: visibility on/off
See the file CHANGES for details. The Therion Book was also updated.
Martin